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Warmth is the biggest difference between the Therm-a-Rest NeoAir pads. The XTherm is warm enough for extreme winter conditions, while the XLite is a solid 3+ season or mild year-round pad for more general use.
All the NeoAir pads are very small and light given their warmth and comfort. The UberLite is the most ultralight and has a truly impressive compact size. The XLite is still one of the most compact pads available. The XTherm is only slightly bigger and heavier than the XLite, but much warmer.
The UberLite sacrifices durability for lightness, as its 15 denier fabric is prone to punctures. The XTherm uses durable 70D fabric on the bottom for the most reliable pad. The XLite's 30D fabric strikes a middle ground.