Baby Board Shorts vs Swim Trunks: Sun Safety
By Natural Baby Shower | Published: 2026-10-30
Category: Comparisons
Compare baby board shorts and swim trunks for sun safety. Learn about UPF protection, built-in swim diapers, and quick-dry fabrics to keep your toddler safe at the beach.
Quick answer
For babies and toddlers, board shorts with built-in UPF protection and an integrated swim diaper offer superior sun safety and convenience compared to standard swim trunks.
Sun protection built in
The main difference between baby board shorts and swim trunks is the level of sun protection. Many board shorts for little ones come with a UPF rating, meaning the fabric itself blocks a significant portion of UV rays. Standard swim trunks often lack this feature, leaving more skin exposed to the sun.
Convenience of integrated swim diapers
Some baby board shorts, like the Lassig Board Shorts in Powder Blue Lion, include a built-in swim diaper. This eliminates the need for a separate diaper, reducing bulk and making changes easier. The patented moisture-absorbent lining helps keep your child's skin dry on land, which is a practical advantage over traditional swim trunks that require a separate diaper.
Quick-dry and eco-friendly materials
Both board shorts and swim trunks can be quick-drying, but board shorts made from recycled polyester, such as the Lassig Boardie Shorts in Orange Sea Salt, offer an eco-friendly option. The Liewood Aiden Printed Board Swim Shorts use GRS-certified fabric, appealing to environmentally conscious parents. Swim trunks may not always specify sustainable materials.
Trade-offs at a glance
- Built-in swim diaper vs separate diaper: Board shorts with integrated swim diapers (like Lassig) simplify diaper changes and reduce bulk, but they may not fit all babies perfectly. Standard swim trunks require a separate swim diaper, which can be less convenient but offers more flexibility in sizing. Choose board shorts for convenience; choose trunks if you already have a favorite swim diaper brand.
- UPF rating vs no UV protection: Board shorts with UPF 50+ or UPF 80 provide reliable sun protection for the covered areas. Swim trunks typically lack a UPF rating, so you must rely entirely on sunscreen for those parts. For maximum sun safety, board shorts with a UPF rating are the clear winner.
- Quick-dry fabric vs standard material: Both board shorts and swim trunks can be quick-drying, but board shorts often use recycled or certified fabrics. Standard swim trunks may take longer to dry and may not be as eco-friendly. If sustainability matters, look for board shorts made from GRS-certified or recycled polyester.
Product highlights
- Lassig Board Shorts - Powder Blue - Lion: The Lassig Board Shorts in Powder Blue Lion feature an integrated swim diaper and UPF 80 protection. This means you can dress your baby in one piece and skip the separate swim diaper, while the high UPF rating gives you confidence during sunny beach days.
Lassig Board Shorts - Powder Blue - Lion - Liewood Aiden Printed Board Swim Shorts - Sea Creature / Sandy: The Liewood Aiden Printed Board Swim Shorts are made from GRS-certified quick-drying fabric with inner mesh trunks for comfort. If you prefer eco-friendly materials and want your child to stay comfortable while playing in and out of the water, these shorts are a great choice.
Liewood Aiden Printed Board Swim Shorts - Sea Creature / Sandy
Which one fits your family?
Best for
- Parents who want maximum sun protection without reapplying sunscreen as often
- Families who value convenience with built-in swim diapers
Not ideal for
- Parents who prefer using their own swim diaper brand and want more sizing flexibility
- Those who prioritize the lightest possible garment for very hot days (board shorts can be slightly heavier)
