Icebreaker Zone Long Sleeve Crewe Baselayer t-shirt. The patent BodyfitZone technology and strategically-placed mesh panels offer a warm microclimate and breathability. A crew neck prevents the cold from seeping within. The odor-resistant properties keep the sock fresh and supple. Its long raglan sleeves have a bound cuff with thumbholes to prevent the fabric from riding up. Flatlock stitching gives a neat, tailored look.