The new Mammut Eigerjoch Light Insulated T-Shirt for next winter is an innovative down T-shirt is a super-light and compressible layer in the backcountry and a keep-you-warm-where-it-matters component for everyday skiing.

Weighing in at a scant 3.5 ounces and packed with the highest-quality goose down, the Eigerjoch sports a generous front half-sip for easy venting plus laser-cut underarm vents, and comes with a stow bag for easy toting.

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