12 mil thick. 7 oz/yd² with highly ultra-violet resistant treated reinforcing yams. This extremely strong tarp provides superior protection against the elements. For your equipment roof, pool, boat... just about anything. All heat-sealed seams provides for a total water-proofed tarp, with rope reinforced hems and brass grommets approximately 24" apart. Please Note: tarpaulins may actually finish 3-5% less in size for cut-sized.