Immersion Research Thermo Cap
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Here's what other sites are saying:
The Thermo Cap by Immersion Research is the "extra" piece of gear that soon becomes a mandatory part of your winter paddling wardrobe. This super warm, thin neoprene cap retains your body heat right at the site where you lose the most-- your head. Warm and comfortable under a helmet, you'll wonder how you ever went without it!
You've heard of a brain freeze before, but this is ridiculous. Surfing your kayak in a frigid washing machine of a hole is a better idea when you're wearing the Immersion Research Thermo Cap. Made with the same . 5mm brushed neoprene as IR's Thermo Skin tops and pants, this helmet liner offers a low profile so as to not funk with the fit of your helmet. A Lycra edge maintains comfort and a water-resistant seal.