Thermal Crew T Top & Bottoms are perfect for indoor/outdoor winter activities. This Fabric in 100% Combed Cotton has 210 Grams in weight density yet made with 40s soft cotton yarn for that cozy feel. Just picture a nice comfortable pull-over.. Your standard thermal baselayers doesn't even stand a chance. The 100% Pure Breathable Natural Cotton Fabric with a touch of fleece on the inside are premium in material content. They're essential for work, play outdoors or just simply relaxing. Supersoft Cotton fits you perfectly all Over ... iF you are between sizes we suggest buying a size up to factor in the minimal shrinkage of 100% cotton after washing.