When can't choose between long and short sleeves, this versatile jacket lets you choose both. "RoS" stands for "Rain or Shine". If it's raining, the long-sleeved configuration provides warmth, windproofness and a high level of water-resistance. If it's shining, zip off the sleeves and you've essentially got Castelli's iconic Gabba jacket to protect you in mild conditions. Thoughtful touches like enlarged, glove-friendly rear pockets, a dedicated pump sleeve, zippered front vents and extensive reflective panels ensure you're equipped for epic days. Castelli exclusive Gore-Tex Infinium 205 fabric on front-facing surfaces is windproof and highly water-resistant. Gore-Tex Infinium 203 on rear-facing surfaces provides extra stretch and breathability. Taped shoulder seams for extra rain protection. Zips just above elbows to allow use as long- or short-sleeve jacket. Easy-sliding YKK Vislon zipper is covered for extra wind and rain protection. Zippered ventilation openings on side of chest. 2 rear pockets with pump sleeve are enlarged for easy access with gloved hands. Dropped tail offers extended protection from road splash and features a large black reflective panel for excellent visibility from behind.