The inner core is a composite co-polymer material for protection

This bat has been hit with literally one time

grip has some wear from storage

which causes the carbon fibers to be stretched along the front of the shaft and compressed along the back

Not in wrapper

New Nike Pro Unisex XL Combat Knee Sleeve Black/Green Extra Large:Black/Green The inner core is aLightweight Ariaprene material keeps muscles warm and provides support. Mesh for breathability. Nike professional knee sleeve is the same one you see the Pros wearing on TV in multiple sports These Hyperstrong sleeves are a bit longer and have more coverage that the regular ones. Keep the joint loose and supported and also protected from turf, field and gym floor burn. These are the good ones .