What Our Gearhead® Experts Are Saying:“This thermal is legit—thick, breathable, and built like it’ll last for years. I wore it daily on a recent cold-weather trip and it held up to everything: layering under flannels, hiking in frosty mornings, even just lounging around. The waffle knit traps warmth without overheating, and the heavyweight cotton feels like real quality. It fits a little roomy, which is great for layering.”Filson’s Waffle Knit Thermal Crewneck Top is a heavyweight staple built for cold-weather layering and everyday wear. Crafted from thick, breathable cotton, the thermal waffle texture traps warm air close to the body while allowing moisture to escape—keeping you comfortable whether you're out on a frosty hike or posted up by the fire. Classic details like ribbed cuffs and a reinforced crewneck hold their shape over time, while the structured cotton build adds durability and timeless appeal. It's a layer we reach for often—under jackets, beneath a flannel, or worn solo on chilly mornings.