Sources:
- http://www.sportsshoes.com/advice/outdoors/changes-in-sportswear-technology
- FashionEra.com
- “Men Prefer Cotton’s Feel, Features When Working Out.” Cotton Incorporated. 21 Jan 2008.
- “Hot Stuff: This Summer, Versatile Layers are the New Black.” Cotton Incorporated. 6 Aug 2009.
- REI.com
- Nike.com
