The Hot Chillys Women's Micro-Elite Chamois Tight is packed with technical and performance features to keep you comfortable in harsh winter conditions. Constructed with durable Micro-Elite Chamois fabric in a snug, body fitting silhouette, this midweight bottom layer delivers superior moisture management. The four-way stretch fabric and a gusset feature allows for unmatched freedom of movement during any activity. Designed with a smooth, wide waistband which provides a flattering fit, plus, it allows for pants to securely sit around your waist for next-to-skin comfort. Perfect for moderate to high activity when the temps start to drop, the women's Micro-Elite Chamois Tight is a highly technical, high-performing piece of thermal underwear that will keep you warm for years to come. Micro-Elite Chamois Fabric - This technical base layer fabric incorporates an intimate blend of enhanced polyester and spandex fibers to continuously keep you warm, comfortable, and dry. Four-Way Stretch - Four way stretch fabric for unlimited movement to match your active lifestyle. Body Fit - These garments move with you, allowing for easy layering and full range of motion while staying against your skin, plus the snug, body fitting silhouette provides exceptional moisture management to keep you warm and dry. *If you are in-between sizes for this women's thermal bottom, order up one size. - Bio-Silver technology enhances thermal regulation and adds blocking properties. Moisture Wicking - Moisture Transfer Fibers move sweat away from skin to keep you dry. UPF Protection - UPF 30 sun protection for high UV index days. Warmth Factor: 8/10 - Midweight base layer with a napped back and lightly brushed inside for exceptional warmth in cold conditions.