A lot of people seem to like the STX RX3 line for light and form fitting. I have shoulders, shins, and elbows in the 3.1 models and like all of them. I haven’t weighed them, but they don’t feel bulky. Elbow have a three piece design and shoulders have multiple pieces attached to be flexible, and I feel like both of them sit close to my body and articulate with my movements. Shins and elbows have great wrap, and fit well on my skinny limbs.