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This iteration of the Mountain Hardwear Lamina Sleeping Bag brings the same extra toasty punch in a lighter and more durable package. The updated materials are built to withstand rugged adventures, pack down smaller, and maintain the same heat-trapping performance we loved in its predecessor. Constructed with Mountain Hardwear's proprietary seamless Lamina design, this bag gives us max loft and zero cold spots for extremely cozy nights under the stars, while the strategically mapped synthetic fill continues to insulate even in wet conditions.