The Therm-a-Rest Synergy Sleeping Bag Liner is a versatile and lightweight layer that adds up to 5F/3C degrees of warmth to a sleeping bag. Its stretch-knit fabric fits optimally to create a soft, base layer for providing comfort and protection from cold during wintry nights.

• Extremely lightweight and highly packable design without sacrificing warmth
• Stretch-knit fabric and flatlock seams perimeter keep it soft and comfortable
• Keeps your sleeping bag dirt and oil-free for easy washing and durability
• Adds up to 5F/3C degrees of warmth to any sleep system
• Roomy space for accommodating different sleeping postures