Bodyfitzone constructionthe zone features icebreaker39s bodyfitzone construction which combines lightweight 200gm stretch merino wool with strategically placed merino mesh panels to help regulate temperature during stop and go days a deep half zip aids in dumping heat when youre moving fast and the gusseted side panels keep the shirt from pulling up while reaching flatlock stitching eliminates chafing during day after day of dynamic motion the natural odour resistance of merino also m