The worst part of any bivy — planned or otherwise — is listening to the rain tap tap on your face. The Black Diamond Hooped bivy sack creates air space to help keep the claustraphobia down and the rain a reasonable distance away. Waterproof and windproof Toddtex for shelter in all four seasons. Still ultralight and with a sizable no-see-um mesh panel to keep the critters out and allow the fresh air in. Stuff sack included.