special vent inserts make sure there's enough cooling air coming inside the jersey while hot

The Gore-Tex® Invisible Fit membrane repels the elements without compromising fit while a balanced blend of traction and grip will keep you upright and secure on all types of terrain

it also ensures excellent moisture wicking

Stability control System™ (SBT): stability control system that integrates GORE-TEX SURROUND® ventilation outlets

the Cloudvista combines Helion™ superfoam with CloudTec® for unbeatable comfort

osprey sirrus 36 sirrus 36 2591004522119 301227 special vent inserts make sureInspired by Osprey's AntiGravity technology, Sirrus 36 provides a fully adjustable AirSpeed ventilated back system which combines single piece construction of the backpanel and hipbelt with highly breathable suspended mesh. This allows for increased comfort in warm weather, even with a heavy load. Sirrus' backsystem also offers an impressive women's specific fit, with an ergonomically shaped hipbelt, harness, yoke and backpanel. FEATURES & FIT