Rokker Boulder Riding Shirt The Rokker Boulder Riding Shirt is a highly abrasion-resistant riding shirt with two-layer construction. Pockets for optional D3O Ghost armor on shoulder, elbows and back gives riders more protection. Fit: Classic regular fit Construction: Outer: 100 Cotton Flannel Inner: Abrasion-resistant Uhmwpe stretch denim (68 Cotton, 25 Coolmax polyester, 6 Polyethylene, 1 Elastane) Ventilation: Ventilation zipper in armpit Protection & Safety: Pockets for optional shoulder, elbow and back protectors (sold separately) Comfort: Zipped sleeve hem for adjustment Pockets: Two chest pockets fastened with press buttons Two side entry pockets with hidden press buttons Other Features: Hidden front zip covered by press buttons