We are aware that riding in the heat of summer can take away all the pleasure?so the body of the shirt is a tough, ventilated, and flexible fine mesh. Armored arm/elbow, shoulder, chest and back elements are then attached onto the mesh. The entire shirt is very light and feels like you have nothing on but yet it is nice and snug (This is what you want in body armor in case you crash the armor will not role off your elbows) but yet it is very comfortable.______________The entire jacket is very light and feels like you have nothing on but yet it is nice and snug (This is what you want in body armor in case you crash the armor will not role off your elbows) but yet it is very comfortable. You can wear your current jacket/jersey over this armor shirt and you will be very comfortable. ___________ This is a serious piece of body armor with a variety of uses. We sell most of them to racers to be worn under leathers, but a growing demand for this jacket is in the extreme sports sector like Climbing, Cycling, Equestrian, Ice & Roller Hockey, Ice Skating, Snow Skiing, Snowmobiling, Roller Skating, Skateboarding, BMX Bikes, Mountain Bikes and other actions sports. We've even sold some to stunt men! This is designed with the adventure rider in mind?whether it's on the track, street, off-road or in the field. You can wear this armor alone or under jackets from Joe Rocket, Fieldsheer, AlpineStar, Venson, AGV, Teknic, Spidi, Dainese, Corner, Spyke, First Gear, Harley Davidson, Hein Gericke, Tour Master, Kushitani, RoadGear, Arlen Ness, Belstaff, Aerostitch, Z Customs, Icon, Oneal, Honda, BMW, Yamaha, Suzuki, Buell, Ducati, Aprilia, Trimph, Kawasaki and other branded jackets and leathers.