Icebreaker Size Chart A technical yet stylish midlayer for winter adventures on or off the mountain, the incredibly cozy Affinity Thermo Long Sleeve Half Zip masters the art of temperature regulation and looks good doing it. Featuring a technical blend of soft, breathable merino wool and Polyester with innovative Thermoquilt fabrication, the Affinity Thermo's quilted pattern works naturally with your body's microclimate to trap warmth close to your body when you're cold, and release it through zoned panels when you're on the go. Underarm gussets provide ample range of motion, thumbhole cuffs add a cozy touch, and the zip-neck design allows for quick heat venting. Features: - 200gm Merino fabric performs in moderate to cool conditions - Merino naturally wicks away moisture, dries quickly, and resists odor - Textured face fabric with flat back provides optimal thermal properties - Zip neck collar for temperature regulation - Zipper chin guard and interior storm flap prevent chafing - Low profile merrow stitch seams for comfort against next to skin - Thumbhole cuffs - Underarm gusset for comfort and mobility - Rib bottom hem - Center back length: 64.2cm / 25 1/4" (Size M) - Icebreaker tonal embroidered logo - Weight (Size Medium): 320 g / 11.28 oz - 100% Merino wool