The Mens Quantum Long Sleeve Zip Hoodie from Icebreaker is an indispensable alpine midlayer designed with stretchy, body-mapped merino wool, the Quantum Long Sleeve Zip Hood provides essential insulation and intelligent breathability for technical mountain climbs, ski tours and other high-output adventures. Designed with our BodyFitZone merino-blend fabric, the Quantum features anatomically body-mapped panels of our stretchy merino terry fabric for heat retention, with merino eyelet mesh in key areas for ample ventilation when you’re moving fast. The form-fitting hood adds additional warmth and fits under your climbing or skiing helmet. Underarm gussets allow for added range of motion when you’re planting your ski pole or reaching for the next hold, while flatlock stitching and forward-set side seams eliminate chafing. Zippered hand pockets and a zippered chest pocket keep your small essentials secure.