Sports thermal/technical base layer. The high percentage of polypropylene makes this article lightweight, breathable and at the same time offers an excellent thermal insulation. Polypropylene, antibacterial by nature, combined with polyamide has allowed us to deliver a resistant fabric that will not lose shape. Finally, the high elasticity makes the base layer very close-fitting creating a "second skin" effect, suitable for all those operating in cold environments or in unfavorable climatic conditions. U-POWER CHAMONIX THERMAL BASE LAYER