The gap between the two roof tiers is what keeps the space underneath tolerable in summer: hot air escapes upward instead of collecting under a single sheet of fabric. Polyester over a steel frame covers 12 x 10 ft at 9.5 ft high, shading a table for six or a seating group. Eight ground stakes anchor the legs, and a drain hole prevents water pooling on the roof after rain. Net weight 81 lbs; assembly required.