Not sure if they needed re-invention, but we did it anyway. The DL arm warmers incorporate 3 different fabrics panels. The base fabric puts the “warm” in arm warmer, while the Italian mesh provides the stretch and the venting that makes this fit and perform like no other you have tried. The cuff really ties the room together and provides a silky place to rub off the snot coming out of your face. A small portion of gripper on the upper arm keeps it in place without annoying the shit out of you and turning your arm into sausage casing. But that is just like, my opinion.