Osprey's Duro and Dyna running vests cover everything from a minimalist belt for short efforts through to fully featured race vests for those going deep into the ultra calendar. At the top end, the Duro Pro 10 and Dyna Pro 10 were developed with elite athletes and honed on the ultra circuit – 10-litre vests with bounce-free soft flask pockets, a removable pole quiver for mid-run stowage, pass-thru pockets for access without removing the vest, and a GPS tracker attachment loop for race day. The broader range scales down in volume and weight for shorter efforts and training runs, with dedicated men's and women's fits throughout. Recycled bluesign® approved fabrics across the range. Use the filters to find the right fit for your distance.