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Bulky running gear? Forget it! We can do better than that. Here is what the expert has to say...
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Upper Body : The key to winter running dressing, especially with your upper body, is layering. Not only do layers trap body heat, they allow sweat to move through the layers of clothing. The moisture is wicked away from your first layer to your outer layers, and then evaporates. Here's a guide to how you should layer on your upper body:
Wicking Base Layer: The layer closest to your body should be made from a synthetic wicking material, such as DryFit, Thinsulate, Thermax, CoolMax, polypropolene, or silk. This will wick the sweat away from your body, keeping you dry and warm. It's very important to make sure you don't wear cotton for this layer because once it gets wet, you'll stay wet. When it's above 40 degrees F, you can usually wear just a long-sleeve base layer. Insulating Layer: Your second or middle layer, which is needed for very cold weather (below 10 degrees F), should be an insulating material, such as fleece. This layer must continue wicking moisture away from the skin. It should have the perfect balance of trapping some air to keep your warm, yet release enough vapor or heat to avoid overheating. Some fabrics suggested for your second layer: Akwatek, Dryline, Polartec, polyester fleece, Microfleece, Thermafleece and Thermax.
Wind- and Water-proof Outer Layer: This layer should protect you against wind and moisture (rain, sleet, snow), but at the same time allow both heat and moisture to escape to prevent both overheating and chilling. It's a good idea to wear a jacket with a zipper for this layer, so that you can regulate your temperature by zipping it up and down. Suggested outer layers: ClimaFit, Gore-Tex, Microsuplex, nylon, Supplex, and Windstopper. If it's between 10 and 40 degrees F, you can usually get away with a wicking base layer and an outer layer.
Gloves/Mittens: You can lose as much as 30% of your body heat through your extremities, so it's important to cover those hands. On cold days, wear gloves that wick away moisture. When it's extremely cold, mittens are a better choice because your fingers will share their body heat.
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