For lightweight durability, easy packing, and simple comfort, it's tough to beat the Therm-a-Rest Ridgerest Classic Sleeping Pad. Made with ultra-durable crosslink polyethylene foam with heat-trapping ridges, the Ridgerest has been around forever and hasn't changed much, because it hasn't needed to. If you're looking for simplicity and cost-effectiveness for the trail, you just can't beat it. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.