Kids Swimwear Guide: Frugi, Hatley & Joules — Sun Protection & Style

Summer is here, and whether you're heading to the beach, the lido, or the garden paddling pool, getting the right swimwear for your little ones matters. At Koast, we've curated the best in kids' swimwear from three of our favourite brands — Frugi, Hatley, and Joules — with a special focus on sun protection suits that keep children safe while they splash and play.

Why Sun Protection Swimwear Matters

Children's skin is far more sensitive to UV rays than adult skin, making sun protection an essential part of any summer wardrobe. Sun protection suits — also known as rash vests, sunsuits, or UV suits — offer UPF (Ultraviolet Protection Factor) ratings that shield delicate skin from harmful rays. Paired with sunscreen on exposed areas, they're the gold standard for keeping kids safe in the sun.

Frugi — Organic, Ethical & Brilliantly Bright

Frugi is a firm favourite at Koast, and it's easy to see why. Made from GOTS-certified organic cotton and recycled fabrics, Frugi's swimwear range is as kind to the planet as it is to your child's skin. Their sun protection suits come in bold, joyful prints — think tropical fish, sea creatures, and vibrant florals — that kids absolutely love.

Frugi's UV swimwear typically offers UPF 50+ protection, covering arms and legs for maximum coverage. Their sunsuits are quick-drying, chlorine-resistant, and built to last through many seasons of adventures. Available in sizes from newborn through to older children, Frugi makes it easy to kit out the whole family.

Hatley — Playful Prints with Purpose

Hatley brings their signature whimsical style to the water with a swimwear collection that's as fun as it is functional. Known for their eye-catching prints — from dinosaurs and sharks to butterflies and rainbows — Hatley swimwear is designed to make kids excited about getting dressed for the beach.

Their rash guards and swim sets offer excellent UV protection, with many styles featuring UPF 50+ ratings. Hatley's swimwear is crafted from durable, stretchy fabrics that move with little ones as they run, jump, and dive. Mix-and-match swim tops and bottoms make it easy to create a look that's uniquely theirs.

Joules — Classic British Style Meets Coastal Living

Joules brings their quintessentially British coastal aesthetic to kids' swimwear with a collection that balances style and practicality beautifully. From classic stripe rash vests to all-in-one sunsuits, Joules swimwear is designed with active children in mind.

Joules sun protection suits are a particular highlight — offering full-body coverage with UPF protection, they're ideal for long days at the beach or on the water. Crafted from high-quality, quick-dry fabrics, they're easy to rinse and ready for the next adventure in no time. The range spans babies through to older children, with styles that grow with your family year after year.

Our Top Tips for Choosing Kids' Swimwear

• Look for UPF 50+ ratings — this blocks 98% of UV rays and is the highest level of protection available.
• Choose full-coverage sunsuits for babies and toddlers who can't yet apply their own sunscreen.
• Go a size up if your child is between sizes — swimwear should be comfortable, not restrictive.
• Check for chlorine resistance if your little one is a regular pool swimmer.
• Bright colours and fun prints make it easier to spot children in the water — a practical bonus!

Shop Kids' Swimwear at Koast

Explore our full range of kids' swimwear from Frugi, Hatley, Joules, and more — available online and in store at Koast. Whether you're after a classic rash vest, a vibrant sunsuit, or a complete swim set, we've got everything you need for a safe and stylish summer by the sea.