It's the same concept behind storm windows. If you can trap a layer of air between you and the elements, you'll be a lot more comfortable. This layer is right next to your skin and it should be made of fabric that will draw moisture away from your body. This will keep you dry and comfortable. Again, fabrics such as CoolMax or Polypro are best.
Fleece is the most well-known fabric for trapping heat.
If possible, it should also release the perspiration from your inner layers. Everyone is different and you'll discover what's most comfortable. You can find layers, gloves, hats, etc., at any good running or sports apparel store. Ken Mattsson is the race walk coach and instructor for the Cambridge Sports Union of Cambridge, Massachusetts, on the staff of the Cambridge Center for Adult Education, and a walking consultant for WalkWays Productions, a race walking and fitness walking instruction company. All rights reserved.