- SKU: #8533506
- Calvin Klein Underwear Men's Size Chart
- Power through your workout with necessary comfort afforded to you through the Calvin Klein™ Air FX Collection.
- Air FX is an update to the former Tech Active program.
- Fabricated from a lightweight, breathable microfiber.
- Crafted from a moisture-wicking micro mesh material designed to improve breathability and prevent sweat build-up.