O'Neill Thermo-X Men's Short Sleeve Top Black Medium

Lightweight Insulation with Maximum UV Protection
The O'Neill Thermo-X Short Sleeve Top is engineered as a high performance thermal rash guard and wetsuit base layer for cold water and variable conditions. Designed to deliver dependable base layer insulation without added bulk, this men's thermal surf top combines warmth, mobility, and quick dry performance. With UPF 50+ maximum protection, it supports extended sessions under the sun while maintaining low profile comfort beneath a wetsuit.

Thermo-X HyperDry Fabric Technology
Constructed with Thermo-X HyperDry fabric, a 210gsm nylon and spandex blend with HyperDry technology, this men's cold water base layer provides maximum insulation with minimal water absorption. Quick dry 4 way stretch fabric enhances natural movement, while strategic seam placement supports flexibility during paddling and swimming. Flatlock stitched breathable seams help reduce irritation, making it an ideal thermal layering top for demanding water sports.

Performance Fit for Seamless Layering
The performance fit contours closely to the body like a second skin, allowing it to function efficiently as a thermal wetsuit underlayer. A super low neck design prevents interference with wetsuit seals, and rash protection helps minimize chafing from board contact and repetitive motion. The boardshort connector cinch cord keeps the top securely anchored during active movement, supporting reliable warmth and streamlined layering throughout your session.