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Winter camping in your dome away from home gets even better when you're wearing our toasty slip-on mules insulated with new ThermoBall™ synthetic technology. ThermoBall™ achieves the warmth equivalent of 600-fill down while providing the wet-weather insulating performance of a synthetic for versatile coverage. The water-resistant ripstop exterior provides additional protection when exposed to light moisture.
The new synthetic alternative to down, ThermoBall™ achieves the warmth and compressibility of down while also offering the wet-weather insulating performance of synthetics. The small, round PrimaLoft® synthetic-fiber clusters closely mimic down clusters by trapping heat within small air pockets to retain warmth. This revolution in insulation has been independently tested by Kansas State University and is proven to offer the warmth equivalent of 600-fill goose down.