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BlueseventyThermal Skull Cap


Item # BLS0023

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  • One Color, S ($44.95)
  • One Color, L ($44.95)
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Item # BLS0023

Warm to win.

It shouldn't come as a surprise that cold water racing requires cold water protection. It's for this very reason that Blueseventy created both the Skull Cap and the Thermal Skull Cap found here. Both are constructed from 3mm Yamamoto Neoprene (the same neoprene found in its Reaction wetsuit), which provides all of the hydrodynamics, warmth, and comfort that's found in a wetsuit. So, what's the difference? Well, the Thermal Skull Cap has been given a Merino wool lining. That's right, we said Merino wool. If you're remotely skeptical, you needn't be. Merino is naturally water-repellent, and even better, this wool actually gets warmer when it's wet.

In terms of fit, 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 Thermal Skull Cap is available in one color and in the sizes Small, Medium, and Large.

Tech Specs
[outer] Yamamoto neoprene, [lining] Merino wool
Recommended Use
cold water triathlon
Manufacturer Warranty
1 year


Skull Caps
Head Circumference

< 22in

(< 55.9cm)

22 - 24in

(55.9 - 61cm)



Neoprene Socks
 S L
Shoe Size (EU) 35 - 41   42+
Toe Covers
 S L
Shoe Size (EU) 35 - 41   42+

View more Swim Caps

    What do you think about this product?


    >Rating: 5

    Blueseventy skull cap

    I've put it through the wringer

    One of my best investment. Lake Michigan was super chilly this summer average temp 54 degrees from May to September. I used for my training and Ironman Racine and Chicago Triathlon. I had my best swim times this summer.

    >Rating: 5

    Ice cream headaches got you down?

    I've put it through the wringer

    This cap really kicks out the warmth, which I find very helpful in the lakes around my northwest home base. It's hard to say just how warm it is but if you find yourself needing to swim in really cold water (who doesn't. am I right?) this is great pickup. I've been giving it regular use for a couple months and its holding up great.