Herschel Little America Backpack 30L Raven Crosshatch Wheel Height 72mm FeaturesHeavy duty ramp style knee padsRamp 4x90mm Spinner wheels FeaturesHeavy duty ramp style knee padsRamp friendly countersunk rivetsErgonomic knee recesses for added comfortDebossed ramp cap logosSuper comfortable fitMeasured above the kneeXS To fit users 27 32cm around the kneeS To fit users 30 36cm around the kneeM To fit users 34 41cm around the kneeL To fit users 38 45cm around the kneeXL To fit users 42 48cm around the knee offering the "Recall effect" with soft foams that wrap smoothly around your feet for optimal contact and comfort Put Yourself Out There™ internal label 600D Fabric made from 100% recycled post consumer water bottles