The design of the SP Plus doesn’t work. I bought the XL, which is the right size for my arm’s length, to keep my arms protected from the sun while cycling. Unfortunately, it slips down below the bicep after a few minutes wear, exposing my upper arm. The elastic at the top isn’t sufficient and the design of the thumb hole works to pull the sleeve down your arm.
I have previously used the standard Sparms sleeve with the separate Sparms gloves and they work well for sun protection. I tried SP Plus because the separate gloves are just a bit fiddly to put on. I’m going back to those products. I can’t recommend the SP Plus.