Inner tent supplied with Second Arrow UL tents produced after October 2014, and is compatible with all Second Arrow tents (both UL and X) produced after October 2014. 20d air-permeable Nylon canopy, 40d polyether polyurethane 5000mm HH coated floor. Wilderness Equipment toggle suspension system. IS NOT COMPATIBLE WITH SECOND ARROW TENTS PRODUCED BEFORE OCTOBER 2014, it is too big, and cannot be altered to become compatible.