Not only does the tool -- which costs about $170 -- make for a much prettier-snow cave, it also speeds up the construction process considerably. And the resulting igloos are semi-permanent:

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touts snow structures that stood for three months. Grand Shelters also makes Velcro-based snow shelter doors for keeping the cold out and the warm in.

Here's a pic of the finished product with the door in place in time for dusk:

Made by Grand Shelters, Longmont. Available online at www.grandshelters.com.

• Tech