This bad boy is breaking rules. "Thin, stretchy, & breathable can't be warm!" Wrong. It can. It is. It's the Lukas Q-Zip. Soft, performance fabric Athletic Fit 92% Polyester 8% Spandex Active, lightweight, breathable, easy care, max stretch Waffle material Full stretch Recycled packaging Swannies Golf - Men's Lukas Lightweight Quarter-Zip