Clothing with a UPF 40 rating allows 2.5 of UV radiation to pass through, while UPF 50 clothing only allows 2 to pass through. This means UPF 50 clothing provides slightly better sun protection than UPF 40 clothing.
SPF ratings measure the effectiveness of sunscreen in protecting against UVB rays, while UPF ratings measure the effectiveness of clothing in blocking both UVA and UVB rays. SPF is for sunscreen, UPF is for clothing.
The key differences between JNK and HYG are that JNK is an exchange-traded fund (ETF) that focuses on high-yield corporate bonds with lower credit ratings, while HYG is also an ETF but it tracks a broader range of high-yield corporate bonds with higher credit ratings.
The SNR (Single Number Rating) measures the overall noise reduction of hearing protection across all frequencies, while the NRR (Noise Reduction Rating) measures the average noise reduction in decibels specifically for high-frequency noise. SNR is more comprehensive, while NRR focuses on high-frequency noise.
The difference between NRR and SNR in measuring sound protection effectiveness is that NRR (Noise Reduction Rating) is used in the United States and SNR (Single Number Rating) is used in Europe. Both ratings indicate the amount of sound reduction provided by hearing protection devices, with higher numbers indicating greater protection.
A Wolf in Sheik's Clothing - 1948 is rated/received certificates of: USA:Approved
Materials like tightly woven fabrics and light-colored clothing can provide better sun protection by blocking more UV rays. Synthetic fabrics like polyester and nylon may offer better UV protection compared to natural fibers like cotton or linen. However, wearing clothing with UPF (Ultraviolet Protection Factor) ratings can provide the highest level of sun protection for the skin.
The Wolf in Sheep's Clothing - 2015 is rated/received certificates of: UK:15
Surge protection and joule ratings for laptops determines its level of protection from electrical damage. When an external surge is detected, the protection equipment immediately blocks it.
Wolf in Thief's Clothing - 1943 is rated/received certificates of: USA:Approved (MPPDA #8908)
Protection - 2000 is rated/received certificates of: Canada:14A (Canadian Home Video rating)
Sizes, weight ratings, ratios, posi/non posi, ........
Here's "BEST's" explanation http://www.ambest.com/ratings/lhbirpreface.pdf for more information see www.steveshorr.com