To fit my skinny biceps, I had to sew the small/medium smaller at the top. An XS size would be useful for many adults and youth. I bought these with bicycling in mind...be aware that the seam at the end is immediately uncomfortable against the handlebars as it forms a lump right under the index metacarpophalangeal joint. I might end up wearing them on opposite arms, losing the palm grip, or above the thumb. All in all, I should have gone with a different product, but these should do for sun protection. The fabric feels nice and cool, and the top grip strip is comfortable.
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