The jupiter bivi bag from terra nova is a single pre curved pole bivi that has been designed to be a super quick and lightweight shelter suitable for minimalist backpackers the pole is made from lightweight aluminium alloy and is pre curved to give extra headroom and ensures good ventilation making it suitable for warmer more humid conditions and the no see um mesh door will protect you from insects the jupiter is made from gas permeable gore tex fl02 material that is extremely breathable to off