Features:

Lightweight: Weighing only a few grams, these are so light you won't be able to tell you've got them with you.
Easy to Use: No special instructions needed. Unfold and use like a regular blanket to help retain your body temperature no matter the conditions.
One-Size-Fits-All: Measures 83" x 55" when open.
Lightweight, Waterproof and Ultra-Warm.
Often times referred to as "space blankets," these innovative, space-age products (originally designed by NASA) are great for anyone who’s putting together a survival kit, a 72-hour emergency kit, or just a regular old car bag. Made from a lightweight reflective material, they help you retain as much as 90% of your body heat, keeping you warm in a variety of conditions.

Specs:

Dimensions: 83" x 55"
Material: Made of Ultra-Light Reflective Polyester Film