FIZX

FIZX — Men's Underwear, Swimwear & Performance Apparel

FIZX is an American men's intimate apparel and activewear brand built for those who demand more from every layer. From sleek men's underwear and swim bikinis to jockstraps, tank tops, and runner shorts, every FIZX piece blends fashion-forward design with real-world performance.

The FIZX range centres on a signature rayon-spandex blend — 95% rayon, 5% spandex — delivering a smooth, lightweight feel with just the right amount of stretch. Covered string waistbands, dye-to-match thread sewing, and self-fabric piping on leg openings give each piece a refined finish that holds its shape wear after wear.

Explore the FIZX Range

• Jockstraps — Sexy and functional, with classic and removable-pouch designs in poly-spandex and polyamide-elastane — perfect for everyday wear or special occasions
• Bikinis & thongs — Low-rise and full-coverage styles with snug or plus pouch options for a flattering, secure fit
• Swim bikinis — Bold, unique designs with removable push pad and drawstring waist in chlorine-resistant polyamide-elastane — made to make a splash
• Tank tops — High-performance, breathable construction ideal for gym sessions or casual wear
• Runner shorts — Unmatched comfort and durability for athletic activities or relaxed lounging
• Harnesses — Neoprene construction with six attachment rings, contrast border, and secure clip system

Fabric & Care

FIZX garments are made to last. Machine wash cold on a delicate cycle and tumble dry on low heat to keep fabrics smooth and colours vivid. Polyamide-elastane styles offer excellent stretch recovery for a consistent fit over time.

Shop FIZX — American designed men's underwear, swimwear and activewear that pushes the boundaries of traditional fashion, one confident layer at a time.