Experience unparalleled warmth and comfort with Extra Heavyweight Thermal Knit Bottoms. Made from 100% cotton, these 9 oz heavyweight thermal underwear bottoms are exceptionally soft and preshrunk to ensure a perfect fit from the first wear. Designed to keep you warm in the coldest conditions, these thermal bottoms feature cuffed ankles for a secure fit. Whether you're braving the outdoors or just need extra warmth, these bottoms are your go-to base layer. A matching top is also available for a complete thermal outfit.