Tresk Layered Sweatshirt. 1 fabric in 3 different colors, stitched together forming a nice wrap around of your torso and arms. 
 
Fabric starts to have more give over training time and washing.
 
Twitch is 5'10, 160 lbs
He is wearing a Large
("Do I look happier in this one guys? lol)
 
Omar is 4'10, 100 lbs
He is wearing a Small
(He's too adorable to not use him for product photos -Twitch)