As the name suggests: the Rab Siltarp 1 is a silicone tarp for one.Using ripstop Cordura fabric treated with Sil-Coat, a silicone treatment which is impregnated into the nylon so that it can\'t peel off, the Siltarp is ultralight, waterproof and incredibly strong.Multiple lightweight webbing loops facilitate a variety of set up options: it can be set up using trekking poles or strung between trees (trekking poles and rigging gear not included).This versatile bit of kit is ideal for forming part of a lightweight shelter system. Designed for adventure racing - where weight is obviously critical - the Siltarp 2 is also very useful for ultralight backpackers, survivalists, and for emergency use for anybody active in the outdoors.