Answer:
For Basketball?
A lot of things.
-Cover up obscene tattoos
-Warmth
-Compression (Circulation; help heal from injuries faster)
-Helps your elbow stay straight so it helps your form a bit
-Stylish
-Covers cuts; helps prevent cuts
Kobe, AI, LeBron, Carmello, Wade, and a lot more all wear shooter sleeves.
I think they are awesome.
You can buy them at www.customsportssleeves.com
Dont forget Howard
Go to www.dotshotbasketball.com to find out how shooting sleeves can improve your accuracy. The DotShot is a patent pending shooting aid endorsed by hall of famer, Rick Barry, and uses "DOTS" to help players shoot with proper alignment and proper arc. Ingenious!