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Item # BLS000C

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Item # BLS000C


Whether you race triathlon or enjoy open water swimming as its own discipline, if you only swim in the pool your first race might be a bit of a shock — especially if the water is cold. For these reasons, Blueseventy created its Skull Cap. 

Constructed from 3mm Yamamoto Neoprene (the same neoprene found in its Reaction wetsuit), the Skull Cap provides all of the hydrodynamics, warmth, and comfort that's found in a wetsuit. To keep it snug to your head, Blueseventy incorporated a flexible central panel along the top of the head. And as a result, the Skull Cap is conforming to most head shapes and sizes. Securing this fit, the cap extends over the ears and down into an integrated chin strap. This piece is soft and malleable, providing exceptional fit without inducing abrasion.

The Blueseventy Skull Cap is available in the sizes Small, Medium, and Large.

Tech Specs

Recommended Use:
cold water swimming

Size chart



Skull Caps
Head Circumference-22.0in
Neoprene Socks
Shoe Size (EU)35-4142+
Toe Covers
Shoe Size (EU)35-4142+

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Never a cold head with this cap!

  • Familiarity: I've used it several times

Visited friends who lived up in the mountains and we went out to open water swim in some of the lakes around their house, bought this as the water was pretty chilly. Threw this lovely cap on under a swim cap - head felt warm the whole time in <60 degree water!

Perfect for cold mornings

  • Familiarity: I've used it several times

I have this little cap and it is awesome. It helps keep my head warm during the early and late season open water swims.

Solid product

  • Familiarity: I've used it several times

I wear this when the water in my lake is below 65 degrees for extra warmth. I wear a size 71/8 fitted hat and ordered the medium and it fits fine. Someone told me to put my latex cap over the top for extra warmth and that works well.