The new version of the best selling running vest now has more accessible storage and is almost half the weight scott tested out prototypes of the scott jurek ultra vest 30 while on his 43 day record setting appalachian trial run and modification were made per his suggestions and experience with the vest materials 150g knit mono mesh new 150gsm harness conforms to your body for absolute comfort and superior load carrying 180g darlington power mesh lightweight strength with differential str