evo.com | Outdoor Research Fashion Hats > Baseball caps do nothing once the temperature drops, which is where the Outdoor Research Vesper Insulated Bucket Hat steps in. A bluesign approved nylon and elastane shell wraps lightweight insulation around your whole head, not just your ears, for warmth that works as well on a chilly hike as it does walking the dog on a frosty morning. Durable S/M Fits a head circumference of 21"-22.5". Shell bluesign(R) approved 87% Nylon, 13% Elastane. Lining bluesign(R) approved 90% Nylon, 10% Elastane. L/XL Fits a head circumference of 22.5"-24". | Outdoor Research Vesper Insulated Bucket Hat 2027 - Large/X-Large in Black | Nylon/Elastane