ALPINESTARS Nucleon Flex Plus Shoulder Protectors - Large 6521220-10-L Monteira Drystar XF Jacket They are made of UHMW-PE

They are made of UHMW-PE (ultra high molecular weight polyethylene)

Ribbed stretch cuff with zippered closure

(2) 5/16"-18 x 3/4" hex head bolts

Will not fit sissy bars with welded inserts

Constructed of stainless steel and aluminum for increased strength and durability while giving riders a more affordable alternative to titanium

ALPINESTARS Nucleon Flex Plus Shoulder Protectors - Large 6521220-10-L Monteira Drystar XF Jacket They are made of UHMW-PEErgonomic design that allows high levels of movement Cell structure ensures maximum comfort and ventilation Slim design makes the protector discreet off the bike Protector cells are bridged together, allowing for an adaptive shape and enhanced levels of comfort and protection