The-thin-but-extremely-warm-Upsilon-2-WB-jacket-helps-maintain-body-temperature-by-keeping-heat-in-&-wind-&-water-out-With-long-sleeves-&-a-micro-fleece-lining-you-can-say-goodbye-to-mid-layer-bulkiness-This-jacket-also-features-the-much-praised-REV-rsquo-IT-WINDBARRIER-reg-a-membrane-that-repels-wind-&-water-&-manages-moisture-for-ultimate-comfort-&-thermal-regulation-Off-the-bike-the-Upsilon-2-doubles-as-a-great-casual-jacket-on-its-own