The RADMerino cashmere blend zip sweater is a light weight sweater, knit from a proprietary blend of 90% natural merino wool and 10% cashmere, providing the ultimate in warmth, with antimicrobial benefits. Our RADMerino is also designed with our bias cut underarm panel 'MoRE|ERoM' (Extended Range of Motion) to maximize movement, and it's knit with a special honeycomb underarm pattern that aids in breathability. This might be the best sweater you’ve ever owned. Size up for roomier fit.