The same way you wouldn't wear a dress to the gym or flip-fops for a hike, some t-shirts are better than others when it comes to performance wear. For your workout, yoga class, tennis match or any other rigorous activity, you want clothing that works as hard as you do. Performance t-shirts and tops include short sleeved, long-sleeved and tank styles. What they have in common is features that keep you cool, comfortable and at your best. Look for moisture-wicking material that pulls dampness away from your body to the outside of the garment. Other important activewear features include four-way stretch for ease of movement, flatlock stitching to prevent chafing, quick-dry fabrics and reflective strips for safety. Add fresh, contemporary styling and you not only feel good, but you look great.