The Exotec chest protector is a hard-shell polycarbonate chest plate that offers optimal airflow, keeping you cool whilst offering full roost protection. The chest plate is ergonomically attached to any CONFIGR8 backpack pack by the use of a ventilated Soft Shell shoulder guard, further enhancing comfort. Zac Speed Exotec protectors come in two sizes (refer sizing chart) Medium/Large and XLarge/XXLarge.