Yes, you should wear sunscreen under clothes if the fabric is thin or has a light weave through which you can see light.
According to Dr. Miller, "If you're going to be wearing something that's really light or a very light weave, then wearing sunblock is really important". The referenced article, "Under Your Clothing" confirms this.
Why Wear Sunscreen Under Clothes?
Even clothes can offer some protection, but the level of protection varies greatly. Here's a breakdown:
- Lightweight Fabrics: Thin materials like linen, rayon, or loosely woven cotton offer minimal sun protection. If you can see light through the fabric, UV rays can penetrate it.
- Darker Colors: Darker colors generally absorb more UV rays than lighter colors.
- Tightly Woven Fabrics: Tightly woven fabrics like denim or tightly woven polyester provide better protection.
- UPF-Rated Clothing: Clothing with a Ultraviolet Protection Factor (UPF) rating offers a specific level of protection, similar to SPF in sunscreen.
How to Choose Sunscreen for Under Clothes
- Broad Spectrum: Opt for a broad-spectrum sunscreen that protects against both UVA and UVB rays.
- SPF 30 or Higher: Choose a sunscreen with an SPF of 30 or higher.
- Lightweight Formula: Select a lightweight, non-greasy formula that absorbs quickly into the skin. This will make wearing clothes over it more comfortable.
- Water Resistance: If you anticipate sweating or being near water, choose a water-resistant sunscreen.
Practical Tips
- Apply sunscreen liberally to all exposed skin, including areas covered by light clothing.
- Reapply sunscreen every two hours, or more frequently if swimming or sweating.
- Consider wearing UPF-rated clothing for added protection, especially if you will be spending extended periods outdoors.
