I have a brand new unused Katabatic Gear Bristlecone Bivy. It's the long version. It's still in the packaging. I've copied the info from Katabatic's website. I have a few Katabatic items and have used another Bristlecone Bivy. I found it to be top notch.

Please email me at Garrett dot Reggie at gmail . Com.
Paypal gift or buyer paying fees. New price is $149. I'd like $120 for it.
The Bristlecone Bivy provides a waterproof floor with a water resistant upper to protect your sleeping bag from spray and mist. This versatile bivy features a continuous zipper extending from waist level all the way across the top, allowing for easy entry and exit.

A large mesh panel over the head of the Bristlecone Bivy provides excellent ventilation while maintaining full bug protection. Sleeping pad attachment points on the floor keep your sleeping pad in place and allow you to integrate your Katabatic Gear sleeping bag with your bivy. The Bristlecone Bivy is lightweight, easy to use, and highly breathable, making it perfect for tarp camping or use under a floorless shelter.
Shell Material: Pertex Quantum Nano Ripstop .9oz/yd
Floor Material: Silnylon Silicone Impregnated Nylon 1.4oz/yd