Here's what other sites are saying:
The Infiniti Track jacket from Brooks keeps you happily clicking off the miles, even if the weather is less than agreeable. Soft, quick-drying and moisture-wicking fabric offers high performance; 2 ripstop polyester panels offer excellent protection from wind and light rain. Durable Water Repellent finish on ripstop panels causes water to bead up and roll off. Stretchy underarm panels offer high breathabililty and protect from the weather thanks to a Durable Water Repellent finish. Reflective details enhance visibility in low light from any angle. Internal pocket manages your music player; zippered pockets shelter hands and accessories. Full-length front zipper offers ventilation. The semifitted Brooks Infiniti jacket is not too tight and not too loose.
- REI refers to the men's version