The Thermarest Z-Lite is a closed-cell foam sleeping pad designed for lightweight backpacking and mountaineering. It features an accordion-style folding design and proprietary dimpled construction that traps heat. The pad incorporates a reflective ThermaCapture coating on one side to redirect radiant heat back to the user, increasing overall thermal efficiency without adding bulk. The durable cross-linked polyethylene foam provides a cushioned surface and is resistant to punctures, making it suitable for use as a standalone pad or as an insulating base layer under an inflatable mattress.