SUMMIT BOARD TS SS M. Alpinisme. Polartec Maille. ACTIVE FIT™. Main Fabrics : POLARTEC® POWERDRY SQUARE // 100% Recycled Polyester. Technical tee for summer mountaineering. The MILLET spirit for operating in the high mountains and the enjoyable lightness of a fluid alpine profile that maximizes moisture wicking and gives exceptional next-to-skin comfort. Round neck. Exclusive Millet print.