Thermarest Synergy Lite Sheets are designed to wrap your sleeping pad in a lightweight layer of comfort for a great night’s rest. Made ultralight for backpacking and backcountry travel, matching perimeter loops make them ideal for use with Therm-a-Rest backpacking quilts. Along with added comfort, they also protect your sleeping pad from dirt and oils, reducing the need for cleaning and extending the life of your pad. Sewn from premium soft-to-the-touch nylon, Synergy Lite Sheets are machine washable for hassle-free care and available in a range of sizes that fit both rectangular and tapered pads. The coupler size joins two pads together to form one large mattress for backpacking duos. The Thermarest Synergy Lite Sheet 20 fits one 51 cm/ 20 inch wide sleeping pad.