Wearing layers and fabrics appropriate for the temperature are important. It doesn't have to be below freezing to be too cold. Remember that you can get cold if you're wearing a tank top and are hit with a freak spring hailstorm on the trail. Any experienced outdoors-person will tell you that layers do the trick.

Moisture-wicking underwear, including long pants and a full-sleeve shirt in very cold weather, or at least a tank top to insulate your chest and belly, will keep the sweat off your skin. Nothing's more uncomfortable than being heavily layered and soggy.

Next, a fleece or wool layer will trap warmth, even when damp. On top of it all, a waterproof and windproof shell works wonders. A jacket doesn't have to be bulky and constricting to do a good job of insulating, especially if you've got the right layers on underneath.

Accessories are necessary. A good hat that covers your ears, winter-grade socks, a waterproof pair of gloves and a scarf are almost as important as the jacket or the boots. Pull socks up and eliminate wrinkles to maximize blood flow to your feet. You're not going to need to invest in any new maternity winter wear either. The advantage of most cold-weather gear is that it stretches, and there is usually some extra room built in. An avid winter sports fan in Denver told me that she wore her one-piece snowsuit snowshoeing well into her third trimester. It became more form-fitting than originally intended, but it was just as comfortable as ever.

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