Retro Puff The Retro Puff Vest has a slim profile and a forgiving fit. Due to the combination of the stretch side panels and a flat-knit rib bottom, the Retro Puff Vest is one of the most comfortable vests Sun Mountain has offered. FEATURES Sustainable 37.5 insulation retains body heat, while 37.5 active particles embedded in the insulation accelerate vapor movement and prevent overheating and moisture build-up. 37.5 insulation provides an extreme weight-to-warmth ratio and never washes out or grows tired Zippered hand warmer pockets. Keep your game sharp with this reliable, comfortable, and stylish gear made for modern golfers who want performance with personality.