The Ultraviolet Protection Factor (or ‘UPF’) rating measures the UV protection provided by a fabric. It is similar to the SPF rating system used for sunscreens.
Lands’ End® swimwear’s rating is UPF 50, which is the highest possible rating. That means it only allows 1/50th of the UV radiation to pass through it – blocking 98% of harmful rays.
However, no clothing can completely block out UV rays, so the use of sunscreen is still recommended.
Note: there are several factors that may affect the level of UV protection. Most fabrics lose some of their UV protection if the garment is stretched out or worn, or if it has been washed repeatedly. Also, when the garment is damp or wet, the amount of UV protection is typically reduced. Lighter colours also tend to lose more of their sun protection when damp or wet than darker colours; for this reason we recommend the use of high-factor sunscreen as well.
Remember: even the highest rated swimwear, clothing and sunscreens can only protect skin against damage for a certain period of exposure to UV radiation. UPF 50 will help delay the onset of sunburn, but not prevent it if care is not taken to limit time spent in the sun.
For maximum safety in the sun, reduce exposure time (especially around midday), wear a hat and seek plenty of shade to reduce the risk of burning and sunstroke.