Free Country Men's Microtech Heat Anti-Odor Heat Retention Base Layer Pant, 2 Pk Only MEDIUM AVAILABLE. The Free Country Mens Lightweight Base Layer Pant is designed to keep you warm and comfortable all day long! The heat retention fabric fiber is specially created to give lightweight warmth and protection. This breathable stretch knit fabric moves with you while wicking away sweat and moisture, and fighting odor! Free Country brings you a layering staple, at a great price, that will keep you moving from one activity to the next with fresh feel all day long!