Designed to fit your kid, the Bantam Roost Deflector offers all the protection of an adult piece sized for the little guy or gal. Biofoam Construction: An impact absorption material designed for comfort and breathability. TPR Shield: A durable pliable material designed to protect the chest and back from debris and impacts. Fit: Form fitting material and adjustable elastic strap allows for maximum comfort and fit. Sizing: Mini S/M is suitable for ages 3 - 5. Youth L/XL is suitable for ages 6 - 9.