Swimmers in a pool with clear blue water
Backstroke & crowded lanes carry hidden dangers

Where are head injuries happening?

One collision can change the future for a young swimmer

Head injuries can take you out for the meet...or out for the season.

Know your risk zones

Hammer Head Swim Cap

Regular price $29.95 USD Sale price $29.95 USD
Free Standard Shipping on all Domestic Orders over $50!
  • 1-Year No-Rip Guarantee
  • 30-Day Returns
  • Looks and Performs Like A Dome Racing Cap
  • Wear Under Your Team Cap
Choose Your Color Black
Choose Your Cap Size Small - 19.5 - 20.5 inch heads
> In stock

How do I measure for the right Hammer Head size?

It’s easy. Just measure the circumference of the head about 1 inch above the ears — that’s the sweet spot for an accurate fit.

For racing or a more compressed feel, wear your team cap over your Hammer Head and goggles. This gives you our signature smooth, wrinkle-free dome for maximum speed and hydrodynamics.

For the best comfort and performance, wear your Hammer Head with the logo centered in front. That’s how the cap is engineered to fit just right.

Hammer Head underwent drop testing by ACT Labs, the global consumer product testing lab, and was proven to reduce impact force by more than 50% compared to silicone and dome caps — making it the safest cap in the water.

But we didn’t stop at safety.

Olympic legend and performance expert Dr. Gary Hall, Sr. tested Hammer Head for drag reduction and found it to be up to 10.5% faster than traditional wrinkled silicone or latex caps. That’s the power of our wrinkle-free Honeycomb Impact Technology.

We strongly recommend wearing it in practice, meet warm-ups, and competition — because protection and performance belong in every lap.

As parents, we invest in the things that help keep our children safe and confident. While traditional swim caps are inexpensive and designed to be replaced when they wear out, Hammer Head® was engineered to do much more. It combines patented head-impact protection, premium durability, and competition-ready performance into one swim cap that's built to last.

With a 365-Day No-Tear Guarantee, it's more than a swim cap—it's an investment in your swimmer's confidence, comfort, and peace of mind every time they dive into the water.

For the best fit and protection, wear your Hammer Head® with the logo in front.

If you have long hair, make a low ponytail and tuck your hair completely inside the back of the cap before adjusting it for a smooth, comfortable fit.

Hammer Head® can be worn by itself or under your team or race cap during competitions, giving you the added confidence of head-impact protection while meeting your team's look.

How do I care for my Hammer Head?

After each swim, simply rinse your Hammer Head and turn it inside out to dry completely. Avoid contact with sharp objects that could puncture the cap — treat it well, and it will deliver long-lasting performance.

Case Study

Brooke's Injury Story

Miscounts in the backstroke lead to concussion

Hear What Our Fans Have To Say

Chris Dahowski
Chris Dahowski Head Coach, Paseo Aquatics

"Because accidental head hits happen so often in the pool, we now require all our Junior-level athletes to wear Hammer Head swim caps in practice and at meets. The safety-first message truly resonates with our swim parents and reinforces our commitment to athlete well-being."

Jill Gage
Jill Gage Swim Mom, Proud Hammer Head Customer

"My daughter Sierra suffered a concussion during the 50-yard backstroke after misjudging her stroke count. She was out of the pool for over a month. While searching for a way to keep her safe, I discovered Hammer Head and immediately shared it with her coach. Now, she never swims without it. Don’t wait until it’s too late—protect your swimmer today!"

Rowdy Gaines
Rowdy Gaines 3x Olympic Gold Medalist & Voice of USA Swimming

"Hammer Head is a simple yet essential piece of equipment for every swimmer. Let’s be real—head hits happen every day, above and below the surface. For the first time ever, Hammer Head combines 50% greater head protection, up to 10.5% more speed, and unmatched durability that outlasts any other cap."

Gary Hall, Sr.
Gary Hall, Sr. 3x Olympian & Founder of The Race Club

"In a drag study test, we found that swimmers wearing Hammer Head’s innovative design at top race speeds experienced up to a 10.5% reduction in passive drag compared to traditional silicone caps. In a 50-meter freestyle, that can mean shaving tenths of a second — the difference between winning and losing."

Josh Davis
Josh Davis 3x Olympic Gold Medalist & NCAA Swim Coach

"Safety is everything in our sport—emotional, mental, and physical. That’s why I’m proud to partner with Hammer Head, a brand that truly shares those values. You’ve got to check them out! Hammer Head is the safest, fastest, most comfortable, and longest-lasting swim cap in the world."

Chris Dahowski
Chris Dahowski Head Coach, Paseo Aquatics

"Because accidental head hits happen so often in the pool, we now require all our Junior-level athletes to wear Hammer Head swim caps in practice and at meets. The safety-first message truly resonates with our swim parents and reinforces our commitment to athlete well-being."

Jill Gage
Jill Gage Swim Mom, Proud Hammer Head Customer

"My daughter Sierra suffered a concussion during the 50-yard backstroke after misjudging her stroke count. She was out of the pool for over a month. While searching for a way to keep her safe, I discovered Hammer Head and immediately shared it with her coach. Now, she never swims without it. Don’t wait until it’s too late—protect your swimmer today!"

Rowdy Gaines
Rowdy Gaines 3x Olympic Gold Medalist & Voice of USA Swimming

"Hammer Head is a simple yet essential piece of equipment for every swimmer. Let’s be real—head hits happen every day, above and below the surface. For the first time ever, Hammer Head combines 50% greater head protection, up to 10.5% more speed, and unmatched durability that outlasts any other cap."

Gary Hall, Sr.
Gary Hall, Sr. 3x Olympian & Founder of The Race Club

"In a drag study test, we found that swimmers wearing Hammer Head’s innovative design at top race speeds experienced up to a 10.5% reduction in passive drag compared to traditional silicone caps. In a 50-meter freestyle, that can mean shaving tenths of a second — the difference between winning and losing."

Josh Davis
Josh Davis 3x Olympic Gold Medalist & NCAA Swim Coach

"Safety is everything in our sport—emotional, mental, and physical. That’s why I’m proud to partner with Hammer Head, a brand that truly shares those values. You’ve got to check them out! Hammer Head is the safest, fastest, most comfortable, and longest-lasting swim cap in the world."

Chris Dahowski
Chris Dahowski Head Coach, Paseo Aquatics

"Because accidental head hits happen so often in the pool, we now require all our Junior-level athletes to wear Hammer Head swim caps in practice and at meets. The safety-first message truly resonates with our swim parents and reinforces our commitment to athlete well-being."

Jill Gage
Jill Gage Swim Mom, Proud Hammer Head Customer

"My daughter Sierra suffered a concussion during the 50-yard backstroke after misjudging her stroke count. She was out of the pool for over a month. While searching for a way to keep her safe, I discovered Hammer Head and immediately shared it with her coach. Now, she never swims without it. Don’t wait until it’s too late—protect your swimmer today!"

Rowdy Gaines
Rowdy Gaines 3x Olympic Gold Medalist & Voice of USA Swimming

"Hammer Head is a simple yet essential piece of equipment for every swimmer. Let’s be real—head hits happen every day, above and below the surface. For the first time ever, Hammer Head combines 50% greater head protection, up to 10.5% more speed, and unmatched durability that outlasts any other cap."

Gary Hall, Sr.
Gary Hall, Sr. 3x Olympian & Founder of The Race Club

"In a drag study test, we found that swimmers wearing Hammer Head’s innovative design at top race speeds experienced up to a 10.5% reduction in passive drag compared to traditional silicone caps. In a 50-meter freestyle, that can mean shaving tenths of a second — the difference between winning and losing."

Josh Davis
Josh Davis 3x Olympic Gold Medalist & NCAA Swim Coach

"Safety is everything in our sport—emotional, mental, and physical. That’s why I’m proud to partner with Hammer Head, a brand that truly shares those values. You’ve got to check them out! Hammer Head is the safest, fastest, most comfortable, and longest-lasting swim cap in the world."

Chris Dahowski
Chris Dahowski Head Coach, Paseo Aquatics

"Because accidental head hits happen so often in the pool, we now require all our Junior-level athletes to wear Hammer Head swim caps in practice and at meets. The safety-first message truly resonates with our swim parents and reinforces our commitment to athlete well-being."

Jill Gage
Jill Gage Swim Mom, Proud Hammer Head Customer

"My daughter Sierra suffered a concussion during the 50-yard backstroke after misjudging her stroke count. She was out of the pool for over a month. While searching for a way to keep her safe, I discovered Hammer Head and immediately shared it with her coach. Now, she never swims without it. Don’t wait until it’s too late—protect your swimmer today!"

Rowdy Gaines
Rowdy Gaines 3x Olympic Gold Medalist & Voice of USA Swimming

"Hammer Head is a simple yet essential piece of equipment for every swimmer. Let’s be real—head hits happen every day, above and below the surface. For the first time ever, Hammer Head combines 50% greater head protection, up to 10.5% more speed, and unmatched durability that outlasts any other cap."

Gary Hall, Sr.
Gary Hall, Sr. 3x Olympian & Founder of The Race Club

"In a drag study test, we found that swimmers wearing Hammer Head’s innovative design at top race speeds experienced up to a 10.5% reduction in passive drag compared to traditional silicone caps. In a 50-meter freestyle, that can mean shaving tenths of a second — the difference between winning and losing."

Josh Davis
Josh Davis 3x Olympic Gold Medalist & NCAA Swim Coach

"Safety is everything in our sport—emotional, mental, and physical. That’s why I’m proud to partner with Hammer Head, a brand that truly shares those values. You’ve got to check them out! Hammer Head is the safest, fastest, most comfortable, and longest-lasting swim cap in the world."

Chris Dahowski
Chris Dahowski Head Coach, Paseo Aquatics

"Because accidental head hits happen so often in the pool, we now require all our Junior-level athletes to wear Hammer Head swim caps in practice and at meets. The safety-first message truly resonates with our swim parents and reinforces our commitment to athlete well-being."

Jill Gage
Jill Gage Swim Mom, Proud Hammer Head Customer

"My daughter Sierra suffered a concussion during the 50-yard backstroke after misjudging her stroke count. She was out of the pool for over a month. While searching for a way to keep her safe, I discovered Hammer Head and immediately shared it with her coach. Now, she never swims without it. Don’t wait until it’s too late—protect your swimmer today!"

Rowdy Gaines
Rowdy Gaines 3x Olympic Gold Medalist & Voice of USA Swimming

"Hammer Head is a simple yet essential piece of equipment for every swimmer. Let’s be real—head hits happen every day, above and below the surface. For the first time ever, Hammer Head combines 50% greater head protection, up to 10.5% more speed, and unmatched durability that outlasts any other cap."

Gary Hall, Sr.
Gary Hall, Sr. 3x Olympian & Founder of The Race Club

"In a drag study test, we found that swimmers wearing Hammer Head’s innovative design at top race speeds experienced up to a 10.5% reduction in passive drag compared to traditional silicone caps. In a 50-meter freestyle, that can mean shaving tenths of a second — the difference between winning and losing."

Josh Davis
Josh Davis 3x Olympic Gold Medalist & NCAA Swim Coach

"Safety is everything in our sport—emotional, mental, and physical. That’s why I’m proud to partner with Hammer Head, a brand that truly shares those values. You’ve got to check them out! Hammer Head is the safest, fastest, most comfortable, and longest-lasting swim cap in the world."

Chris Dahowski
Chris Dahowski Head Coach, Paseo Aquatics

"Because accidental head hits happen so often in the pool, we now require all our Junior-level athletes to wear Hammer Head swim caps in practice and at meets. The safety-first message truly resonates with our swim parents and reinforces our commitment to athlete well-being."

Jill Gage
Jill Gage Swim Mom, Proud Hammer Head Customer

"My daughter Sierra suffered a concussion during the 50-yard backstroke after misjudging her stroke count. She was out of the pool for over a month. While searching for a way to keep her safe, I discovered Hammer Head and immediately shared it with her coach. Now, she never swims without it. Don’t wait until it’s too late—protect your swimmer today!"

Rowdy Gaines
Rowdy Gaines 3x Olympic Gold Medalist & Voice of USA Swimming

"Hammer Head is a simple yet essential piece of equipment for every swimmer. Let’s be real—head hits happen every day, above and below the surface. For the first time ever, Hammer Head combines 50% greater head protection, up to 10.5% more speed, and unmatched durability that outlasts any other cap."

Gary Hall, Sr.
Gary Hall, Sr. 3x Olympian & Founder of The Race Club

"In a drag study test, we found that swimmers wearing Hammer Head’s innovative design at top race speeds experienced up to a 10.5% reduction in passive drag compared to traditional silicone caps. In a 50-meter freestyle, that can mean shaving tenths of a second — the difference between winning and losing."

Josh Davis
Josh Davis 3x Olympic Gold Medalist & NCAA Swim Coach

"Safety is everything in our sport—emotional, mental, and physical. That’s why I’m proud to partner with Hammer Head, a brand that truly shares those values. You’ve got to check them out! Hammer Head is the safest, fastest, most comfortable, and longest-lasting swim cap in the world."

Chris Dahowski
Chris Dahowski Head Coach, Paseo Aquatics

"Because accidental head hits happen so often in the pool, we now require all our Junior-level athletes to wear Hammer Head swim caps in practice and at meets. The safety-first message truly resonates with our swim parents and reinforces our commitment to athlete well-being."

Jill Gage
Jill Gage Swim Mom, Proud Hammer Head Customer

"My daughter Sierra suffered a concussion during the 50-yard backstroke after misjudging her stroke count. She was out of the pool for over a month. While searching for a way to keep her safe, I discovered Hammer Head and immediately shared it with her coach. Now, she never swims without it. Don’t wait until it’s too late—protect your swimmer today!"

Rowdy Gaines
Rowdy Gaines 3x Olympic Gold Medalist & Voice of USA Swimming

"Hammer Head is a simple yet essential piece of equipment for every swimmer. Let’s be real—head hits happen every day, above and below the surface. For the first time ever, Hammer Head combines 50% greater head protection, up to 10.5% more speed, and unmatched durability that outlasts any other cap."

Gary Hall, Sr.
Gary Hall, Sr. 3x Olympian & Founder of The Race Club

"In a drag study test, we found that swimmers wearing Hammer Head’s innovative design at top race speeds experienced up to a 10.5% reduction in passive drag compared to traditional silicone caps. In a 50-meter freestyle, that can mean shaving tenths of a second — the difference between winning and losing."

Josh Davis
Josh Davis 3x Olympic Gold Medalist & NCAA Swim Coach

"Safety is everything in our sport—emotional, mental, and physical. That’s why I’m proud to partner with Hammer Head, a brand that truly shares those values. You’ve got to check them out! Hammer Head is the safest, fastest, most comfortable, and longest-lasting swim cap in the world."

Chris Dahowski
Chris Dahowski Head Coach, Paseo Aquatics

"Because accidental head hits happen so often in the pool, we now require all our Junior-level athletes to wear Hammer Head swim caps in practice and at meets. The safety-first message truly resonates with our swim parents and reinforces our commitment to athlete well-being."

Jill Gage
Jill Gage Swim Mom, Proud Hammer Head Customer

"My daughter Sierra suffered a concussion during the 50-yard backstroke after misjudging her stroke count. She was out of the pool for over a month. While searching for a way to keep her safe, I discovered Hammer Head and immediately shared it with her coach. Now, she never swims without it. Don’t wait until it’s too late—protect your swimmer today!"

Rowdy Gaines
Rowdy Gaines 3x Olympic Gold Medalist & Voice of USA Swimming

"Hammer Head is a simple yet essential piece of equipment for every swimmer. Let’s be real—head hits happen every day, above and below the surface. For the first time ever, Hammer Head combines 50% greater head protection, up to 10.5% more speed, and unmatched durability that outlasts any other cap."

Gary Hall, Sr.
Gary Hall, Sr. 3x Olympian & Founder of The Race Club

"In a drag study test, we found that swimmers wearing Hammer Head’s innovative design at top race speeds experienced up to a 10.5% reduction in passive drag compared to traditional silicone caps. In a 50-meter freestyle, that can mean shaving tenths of a second — the difference between winning and losing."

Josh Davis
Josh Davis 3x Olympic Gold Medalist & NCAA Swim Coach

"Safety is everything in our sport—emotional, mental, and physical. That’s why I’m proud to partner with Hammer Head, a brand that truly shares those values. You’ve got to check them out! Hammer Head is the safest, fastest, most comfortable, and longest-lasting swim cap in the world."

Recognized for Safety, Comfort, and Speed.

Hammer Head was.....

tested by independent lab, ACT, and found to be 50% safer than silicone and latex swim caps.

tested by Dr. Gary Hall, Sr. and The Race Club and found to mirror the performance of a dome cap, which is up to 10.5% faster than all other swim caps.

nominated Product of the Year by WOWSA and endorsed by Sensory Friendly Solutions for its protective, sensory-friendly design and fit.

Nominated Product of the Year award from World Open Water Swimming Association on a white background.
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