The adidas Adizero Singlet shifts its side seams forward and tapes over abrasion points, so the friction that usually builds up over marathon distance never gets the chance to start. Perforated fabric keeps air moving across the body, while a bonded neckline and armholes replace bulky seams that would otherwise rub raw over hours of movement. The slim, barely-there fit stays out of the way, whether the goal is a first finish line or a new personal record. What Our Gearhead(R) Experts Are Saying:"I wore this through a full marathon and never had to think about my sides or armpits, which is usually where I chafe raw by mile eighteen. The perforated fabric kept me from overheating once the sun came out around noon, and I finished without a single hot spot."