MOUNTAIN WEIGHT BASE LAYER - This base layer is designed for warmth, performance (including but not limited to breathability and moisture management), and wearable comfort. The adventure is yours, this will keep you warm and comfortable.

ACTIVE FIT AND UPF 40+ - Designed with 4-way stretch, these fabrics follow the lines of your body for a close-to-skin fit, enhancing breathability and moisture management. Active fit garments move with you, allowing full range of motion while staying close to your skin. Ultraviolet Protection Factor. Sunlight includes rays of ultraviolet (UV) radiation, and Hot Chillys products are designed to help protect you!

WARMTH FACTOR 10/10 - Ranked from Mild to Hot, the Warmth Factor Thermometer tells you how warm each of our products is. Warmth Factors 6, 7, and 8 are considered Midweight and are very popular for most cold-weather activities.

MOISTURE TRANSFER FIBERS - Hot Chillys exclusive moisture transfer fibers (MTF) move moisture away from your body by employing hydrophobic yarns to wick away perspiration, thereby keeping you dry and comfortable.