Just wait until the warm spring day you take off your jacket and reveal the Sonic boom. A partially transparent mesh reveals that you mean business. The Sonic Pull (shirt) is a unique underlayer from Crazy Idea made of polypropylene and spandex. It’s seamless with an athletic fit, offering some protection while allowing your true colors to shine. The Sonic is a great base layer under a race suit or ski touring jacket. Extremely fast-drying, the Pull also wicks sweat and vents your heat. It doubles as a running top on days when you’d like more than a short-sleeve but want to keep your core temps in check. Pull on the Crazy Idea Sonic first thing in the morning and start your day fast.