Troy Lee Designs UPS 5850 Hot Weather Under Jersey Deflector
Features:

Shock Doctor technology
Neck brace integration patent-pending design is compatible with leading neck braces without compromising fit and protection (removable upper chest / spine and clavicle pads accommodate ideal fit with brace)
Strata foam articulates with complex body zones while providing impact protection (removable, rib and bicep pads for coverage preferences)
Vent-trak moves air through flexible channels over skin surface to cool the athlete
Hex mesh disperses impact with a dimensional mesh construction that allows air to flow freely
Open armpit design and wide neck opening for comfort
Anatomical design provides a close fit while integrated zones protect the chest, ribs, back/spine, clavicle, shoulders and biceps.
PATENTS PENDING.