A performance rash guard should be evaluated as an active garment: secure fit, low-friction seam placement, stable hems, recovery through movement and product-specific sun or chlorine claims backed by evidence.
Map movement first
Surf paddling, pool training and recreational coverage use different ranges of motion. Panel lines and sleeve shape should follow the actual activity.
Choose seams by function
Flat seams can reduce bulk, but placement and stretch matter as much as stitch name. Keep high-friction or high-tension areas visible in the review.
Secure openings
Neck, cuff, hem and zip construction affect water entry and movement. Test guards, closures and elastic after repeated stretch.
Document performance claims
UPF, chlorine or recycled-content statements require evidence for the selected material or garment. Do not convert a supplier description into a consumer claim without support.