The ideal all purpose mid-layer, the Icebreaker Men's Sport320 Rock Zip is perfect as a layer over lighter weight Bodyfit or Superfine styles. Providing everyday comfort in 100% pure New Zealand merino wool, this top is soft and highly breathable, resists odor, and minimizes moisture. The regular fit with flat seams and arching shoulder with arm stripe provides optimum performance in a sporting style. The two-way collar (zipped up, or open) provides excellent venting and warmth versatility. Machine washable, the low bulk Rock Zip is perfect for snowsports, activewear, and everyday use.