The difference between three-season camping gear and four-season camping gear is often, unfortunately, a lot of extra ounces. Sleeping bags, pads and tents that handle spring, summer and fall with ease suddenly flounder when permanent snow and below-freezing temperatures are thrown into the mix. Get a four-season product though, and it’s often too hot and too heavy for use in July.

Therm-a-Rest’s NeoAir XTherm is an exception to that broad brush stroke. Every pad in the NeoAir series is remarkably light — yes, there are even less weighty summer pads than this one — but at just 15 ounces (in the regular length size), the XTherm is a four-season pad that requires no concessions. Fully-inflated, the XTherm is 2.5 inches thick, providing more than enough cush for even the rockiest and rootiest campsites. Its fourth-season warmth comes from Therm-a-Rest’s Thermacapture technology, which traps radiant heat within the pad with reflective foil and an internal triangular baffling system. All this tech makes the XTherm capable of providing comfort in temperatures well below zero degrees Fahrenheit, but despite that, it still packs up to the size of a Nalgene, and in fact, has the best warmth-per-ounce of any sleeping pad available.

Right now on Massdrop, the XTherm is down to $140, which is 30 percent off its full price of $200.

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