Craghoppers Kiwi Boulder Long Sleeve Shirt Oatmeal Tan Outdoor Hiking Mens M Mens US Size M Long Sleeve Outdoor Protective Shirt. 65% Polyester 35% Cotton The Kiwi Boulder is made from durable polyester-cotton fabric and features insect bite-proof construction while offering protection from UV rays. this shirt showcases a sleek, tailored design and incorporates low-profile zipped chest pockets for a more contemporary look and feel.