STS – SEA TO SUMMIT Ether Light XR Insulated ASC Mat

Experience unparalleled comfort and warmth on your next adventure with the Sea to Summit Ether Light XR Insulated Air Sprung Cell (ASC) Sleeping Mat.

Designed for backpackers, bikepackers, and backcountry explorers who refuse to compromise on rest, the Ether Light XR features an innovative Air Sprung Cell construction. This unique internal architecture delivers 10 cm/4 inches of plush cushioning, offering stability and support that rivals heavier, bulkier pads. Sleep soundly on roots and rough terrain—every night feels like a luxury.

The mat’s advanced Thermal Core insulation, featured in a suspended TRM layer, effectively reflects your body heat back to you, reducing heat loss and enhancing warmth. With an ASTM-tested R-Value of 4.1, the Ether Light XR is your trusted companion for spring, summer, and fall—and capable for cold-weather adventures.

Inflating and deflating is a breeze, thanks to the Airstream pump integrated into the stuff sack and the high-airflow XPRESS valve. Effortlessly adjust firmness to your liking and enjoy a secure, stable sleep surface all night long. Its lightweight design (as low as 16 ounces) and compact packing size mean you’ll barely notice it in your pack.

Built for durability with increased weld strength and a rugged 30/40D nylon face fabric laminated to the TPU body, the Ether Light XR stands up to the toughest trails. Additional features include the ability to lock your Sea to Summit pillow in place and a handy repair kit for peace of mind.

Key Features

• Air Sprung Cell (ASC) Construction: 10 cm/4 inches of plush comfort, ideal for side sleepers
• Thermal Core Insulation: Suspended TRM layer for superior warmth, ASTM R-Value 4.1
• Ultra-Compact & Lightweight: Weighs from 16 oz; packs small for easy carry
• Easy Inflation: Integrated Airstream pump and XPRESS valve for quick setup
• Durable Design: Reinforced weld strength and tough nylon/TPU shell
• Versatile Use: 3+ season capability—perfect for backpacking, bikepacking, and mountaineering
• Pillow Lock & Repair Kit: Secure your pillow and make field repairs as needed