The Mountain Warehouse Men's Talus Base Layer Bottoms (available as a pack of two) is crafted from 100% polyester fabric. This design maintains a simple and plain aesthetic. The fabric technology includes breathability for comfort, heat retention to keep you warm, high warmth ratings, quick-dry capabilities, moisture wicking properties to manage sweat, and is lightweight for ease of movement. The Isotherm feature ensures consistent body temperature throughout your adventure.