From the manufacturer

Stay warm and dry with the Escape Bivvy, a breathable sleep shelter crafted from a proprietary fabric that allows moisture to escape while still keeping rain, snow, and wind at bay. The Escape Bivvy cuts condensation and reflects 70% of your body heat back to you. The Escape Bivvy will last through multiple adventures with a durable, tear-resistant, and quiet material that won't shred to pieces if punctured.

With a larger updated hood to provide superior warmth and protection, you'll stay warm and stay dry in every condition with this heat reflective bivvy. It’ll last through multiple adventures with its durable and tear-resistant material. The quiet material won't shred to pieces if punctured for a reliable and long-lasting survival tool. When you need warmth without soaking your clothes, pack the reflective Escape Bivvy for a warm and dry adventure.

Features

• A Bivvy that BREATHES - Stay warm AND dry in the original backcountry emergency shelter that stays dry while you heat up. 
• Weather the Elements - Highly water-resistant fabric with a fully-adjustable hood keeps you warm and dry even in wet, soggy conditions. 
• Stay Warm - Reflects 70% of radiated body heat. 
• All-Season Durability - Hard-wearing fabric resists punctures and tears through heavy use.
• NEW: Larger Hood - Updated to provide even more warmth and protection
• NEW: XL Version  - More room for you and your sleeping bag, especially for taller folks. (91 x 39 inches)
• Multifunctional Use – Bring on backpacking trips for a quick shelter or use as a lightweight sleeping bag in warmer months.

Specifications

Dimensions: 84 x 31 inches

Weight: 8.5oz (Regular) or 9.5oz (XL)

Material: Our proprietary Escape ThermaShell material, a specialized spunbonded olefin fabric with a metalized coating. This is the most durable material in the SOL lineup to resist punctures and tears without loading your pack down with unnecessary weight.