What Is UPF Swimwear? A Guide to Sun-Protective Swimwear & Activewear

Published: 2025-04-08

If you're developing a swimwear or activewear line, you've probably seen the term UPF on performance garments. UPF stands for Ultraviolet Protection Factor — a rating that tells you how much of the sun's UV radiation a fabric blocks. Understanding UPF helps you build products that protect wearers and stand out in the market.

What Does UPF Mean?

UPF measures a fabric's ability to block ultraviolet (UV) rays — both UVA and UVB. A garment rated UPF 50+ blocks roughly 98% of UV radiation, letting only about 1/50th of the sun's rays pass through. This makes it an effective barrier for people who spend time outdoors, at the pool, or on the beach.

It's worth noting the difference between UPF and SPF: SPF (Sun Protection Factor) typically refers to sunscreen and mainly measures UVB, while UPF is a fabric rating that covers both UVA and UVB — so a high-UPF garment is a strong form of sun protection.

Why Sun Protection Matters for Swimwear & Activewear

Swimwear and outdoor activewear are worn in exactly the situations where skin is most exposed — swimming, surfing, beach days, running and outdoor training. For kids especially, who are outside for long periods, sun-protective clothing is a practical, re-usable alternative to reapplying sunscreen constantly. Many parents specifically look for UPF-rated kids' swimwear and rash guards for this reason.

Key Features of Quality UPF Swimwear

• UPF 50+ Sun Protection — a high rating that blocks the majority of UV radiation.
• Chlorine Resistant — important for swimwear that sees repeated pool use; helps the fabric and color last longer.
• Quick-Dry — essential for swimwear, so the garment dries fast after water.
• Breathable — keeps the wearer comfortable even in warm conditions.
• Lightweight & Durable — comfortable to wear and built to last through regular use.
• Four-Way Stretch — allows the garment to move with the body during swimming and activity.

Where UPF Clothing Is Commonly Used

• Rash Guards & Sun Shirts — popular for surfing, swimming and beach activities.
• One-Piece & Two-Piece Swimwear — sun-protective swimsuits for women and girls.
• Boardshorts & Swim Trunks — for men and boys.
• UV Swim Hats — sun protection for the head, ears and neck, especially for kids.
• Training & Running Tops — sun-protective activewear for outdoor sport.

Choosing UPF Fabric for Your Brand

At Vista Clothing we manufacture swimwear and activewear with real UPF protection. Our range includes UPF 50+ rash guards, swimsuits with chlorine-resistant fabric, UV swim hats and sun-protective training tops — for women, men and kids. We offer these with full OEM/ODM support so you can build a sun-safe collection under your own brand.

If you're planning a swimwear or activewear line, sun protection is a feature your customers actively search for. Tell us your design and target market — we'll recommend the right UPF fabric and construction for your products.