The Seirus Thick N Thin Headliner combines an ultra-thin, moisture-wicking hood and a cozy, technical fleece neck warmer. The hat's ingenious 4-in-1 design includes a helmet liner, Thermax balaclava, scarf, and Polartec fleece neck-up. The Thick N Thin Headliner features flatlock seam construction for reduced abrasion and a low profile. Imported. One size fits most.