Brooks All Altitude Lightweight Packable Rain Jacket (221520). The Brooks All Altitude Lightweight Packable Rain Jacket 221520 lets you unroll the hood when you need it the most. Zip-up jacket has raglan sleeves, protects against the wind and rain, and folds down for easy packing. Brooks' All Altitude Lightweight Packable Rain Jacket is made of woven polyester/polyurethane.