The lightweight riding jacket that's always worth bringing, the Troy Lee Designs Shuttle Jacket is form-fitting and very pro. It packs down small, so the decision on whether to take it along is always going to be a resounding "yes." When it's on, you'll appreciate the pre-bent sleeves and longer back hem, made to fit best when in riding position. The collar zips up snug to keep the wind out, and there's ample venting at the underarms and across the back. Jackets are the pants of tops: they make you faster!