Features of the Icebreaker Men's Kinetica Long Sleeve Crewe Cool-Lite fabric for comfort in warm to hot conditions Corespun fabric for enhanced durability Eyelet mesh back for enhanced ventaliation Bonded chest and back seams Low profile merrow stitch for next to skin comfort Icebreaker tonal screen print logo Fabric Details Main: 155gm Jersey Corespun, 50% Merino, 33% Tencel, 12% Nylon, 5% Lycra Mesh: 145gm Eyelet Corespun, 51% Merino, 34% Tencel, 15% Nylon