Compression sleeves earn their place through the back half of a session, not the first ten minutes. The graduated pressure supports circulation in the forearm and bicep as fatigue sets in, which is when arm heaviness usually starts to affect shooting form or cycling posture.
The stretch-fit knit moves with the arm through full range rather than binding at the elbow, and it stays in position instead of creeping down mid-game — the flaw that makes cheap sleeves more distraction than help. Breathable fabric wicks sweat away so the sleeve doesn't turn slick and start sliding.
Equally at home on the court, the bike, or a long run. Thin enough to layer under a jersey without bulk, and quick to dry between sessions.