Highly reflective interior for significant increase in reflectivity for improved lighting performance. Thermally protected tent material reflects 97% of all radiant heat for superior insulation. Completely non-toxic, will not react under light and heat, and no off-gassing to harm plants. Improved fabric with thicker fabric than previous models, and includes the best zippers on the market. Moveable roof cross-members that easily adjust lighting and accessories; pieces snap into desired place for better functionality. Multiple intake/exhaust ports including two ports opposite each other at reflector level for air-cooling of lighting system on most models. Adjustable fan and ducting attachments, so no more clamps or reducers needed! Waterproof floor features a second floor that is removable for easy cleaning between crops.