100% Square Weave Cotton Ripstop - 145 gsm Unique square weave fabric and venting allows increased air flow to cool you down while the rip stop construction gives the light weight fabric more tear strength than heavy weight shirts Mesh venting to increase breathability in the under arm, upper back and back side seam Mechanical stretch to give you more freedom of movement 2 Chest pockets with pen partition Vented tape to increase breathability Reinforced at all key stress points with bar tacks Sizes XXS - 5XL