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  • Ultra-thin Thermax® polyester with a bit of Lycra® spandex stretches to fit, wicks away moisture and dries quickly to keep you warm
  • Flatseam construction and 4-way stretch improves comfort
  • The Seirus Thermax skull liner features a reversible design—chose from exposed contrast stitching or solid black


View all Seirus Men's Warm Hats

REI membership


Best Use Multisport
Hat Style Winter Hat, Skull Cap
Fabric 90% polyester knit/10% Lycra spandex
Lining Fabric None
Moisture Wicking Yes
Quick Drying Yes
Gender Unisex
Lining None

The REI Difference

100% satisfaction guaranteed

We stand behind everything we sell. If you are not satisfied with your REI purchase, you can return it for a replacement or refund within one year of purchase.

REI's guarantee doesn't cover ordinary wear and tear or damage caused by improper use or accidents.

If your item has a manufacturing defect in its materials or workmanship, you can return it at any time. See our limited warranty.

Gear & advice you can trust

At REI, we live and breathe the outdoors, and we're passionate about sharing our expertise with people of all skill levels. Whether you're new to the outdoors or a seasoned explorer, we'll take the time to understand your needs and help you find the right gear for you.

10% annual member refund

Anyone can shop at REI, but for a one-time $20 fee you can become an REI member and enjoy a lifetime of benefits. These include an annual member refund, typically 10% back on eligible purchases.*



*10% is typical but not guaranteed. Your refund is based on eligible purchases, which exclude REI gift cards, services, fees, REI Adventures trips, REI Garage, and discounted items. Learn more