This real-time pressure data can be used to make decisions that can affect rolling resistance

Which pretty much means something along the lines of not too baggy and not too tight

Dimensions and weight: 332g excluding bladder

5" insert: 1

Fits all 148x12mm and 142x12mm Santa Cruz frames including:

Leatt MTB Gravity 4.0 Junior Long Sleeve Jersey - Youth XL - Onyx Exclusive This real-time pressure data canLight, cool, and awesome looking! The Gravity 4. 0 jersey is the ultimate premium race jersey designed for young riders. Made from ultra light stretch mesh fabric, it features MoistureCool wicking technology and air channels for superior ventilation. The tailored race fit is perfect for wearing with or without body armor and is neck brace ready! The elbows are reinforced with Brush Guards, an ultra thin flex film that provides feather light protection