FLYSHEET

This provides the protection against the rain, and is made from nylon or less durable polyester that is treated with polyurethane or silicone to make it waterproof. Broadly speaking the heavier the fabric the longer it will last, but the use of ultraviolet (UV) light inhibitors will improve long-term performance. A flysheet that reaches the ground around the edges will keep more wind- driven rain out, but a fly with a big air gap around the base will help reduce condensation. Ladder-lock adjustment is good for fine-tuning tension and tweaking the footprint a bit.