Here's what other sites are saying:
Push the envelope in terms of speed and intensity in the ultralight Helly Hansen Men's Speed Jacket. Fall and spring training often means blustery weather, and you're not out there to a fly a kite. Made from fabric that both breathes and resists wind, the Speed jacket lets excess body heat escape without allowing sweat-drying, chill-inducing wind to sneak in. Do you have a trip planned to train in Colorado Springs because sprints at sea level aren't enough' This jacket weighs next to nothing, barely tipping the scale at 4 ounces, and it squishes into tight spaces (like inside your running shoe), leaving extra room in your bag for energy gels and anti-chafing balms. You'll be grateful for the 2-way stretch fabric at mile 18 of your 22-mile run, when form takes a back seat to finishing, and your arms resemble windmills.
- Backcountry.com refers to the men's version