Wear Your SPF

Sunscreen is non-negotiable. But it’s also unreliable. It wears off, it needs reapplying, and it rarely holds up over the course of a full day outside. Which is why the more considered approach is to build that protection into what you’re already wearing.

Think of it less as an extra step, more as a shift in how you dress. Lightweight layers that cover without overheating. Fabrics that breathe, stretch, and move cleanly with the body. Pieces that offer protection without looking or feeling like they’re trying to.

At Williams, that thinking starts with fabric. Our signature Millie knit is developed to balance softness with structure, a smooth, close hand feel with enough substance to hold its shape over time. It’s engineered with four-way stretch for unrestricted movement, designed to recover cleanly without sagging or pulling, even through repeat wear. The fabric wicks moisture, regulates temperature in warm conditions, and provides consistent UPF 50 protection built directly into the fibers, not applied as a finish that washes out. The result is coverage that feels inherent to the piece, rather than added on.

Discover Our UPF 50 Protection Pieces

Summer 1/4 Zip Top
A lightweight layer designed for warm-weather play. Breathable, high-stretch, and finished with long sleeves, a mock neck, and UPF 50+ protection for consistent coverage throughout the day.

Tinsley Bodysuit
Made in our signature Millie fabric. High-stretch, moisture-wicking, and UPF 50-rated, with added length for comfort and ease through movement.

Tabitha Top
A cleaner, more refined take on performance. Lightweight with a smooth finish, structured by a stand collar and gold zip, with built-in UPF protection.

Romy Top
Short-sleeve simplicity. Soft, sculpted, and easy to wear, with the same Millie fabric performance and a streamlined fit.

Naomi Bodysuit
Designed to stay in place and out of the way. Breathable, UPF 50-rated fabric with extended coverage and subtle, well-considered detailing.

Noelle Long Sleeve Top
An easy long-sleeve option. Lightweight, breathable, and finished with a mock neck and built-in UPF protection for consistent coverage.

Regina Top
The non-bodysuit counterpart to the Romy. Crafted in Millie fabric with the same smooth, sculpted feel, offering lightweight coverage and an easy, polished fit that transitions across settings.

Isla Bra
A lightweight foundation layer. Soft, high-stretch, and designed for light support, with moisture-wicking performance and SPF 50+ protection built in.