1 Spare Presta valve core

waterproof

Cons: It only has a very specific use so you probably won't have the need to use it all that often

Large ventilation channels for extreme ventilation

Clamp slot sizes are:

Fox Raceframe Impact CE Youth Chest Protector - One Size Fits Most - Black NoAusPost 1 Spare Presta valve coreAn ultra slim chest guard with CE certified protection The all new Youth Raceframe Impact Chest Protector offers a slim fit and CE certified chest and back protection. The articulated design wraps the body for unparalleled protection, flexibility, and comfort. The straps are adjustable to fit all body types, and the low profile design can be worn over or under the jersey. Specifications Youth specific fit (6 14 years) Articulated design hugs the body