Updated May 26th, 2024 at 16:14 IST

What Is SPF? Benefits, Usage, Importance In Summer

SPF is a critical component in protecting the skin from the harmful effects of UV radiation.

Benefits of SPF | Image:Freepik

SPF, or Sun Protection Factor, is a measure of how well a sunscreen can protect the skin from harmful ultraviolet (UV) radiation. There are two main types of UV rays: UVA and UVB. UVA rays penetrate deeply into the skin, leading to premature aging and wrinkles, while UVB rays cause sunburn and can contribute to skin cancer. SPF specifically measures protection against UVB rays.

Benefits of SPF

Protection Against Sunburn

SPF helps prevent sunburn by shielding the skin from the majority of UVB rays. For example, an SPF 30 sunscreen blocks about 97% of UVB rays, significantly reducing the risk of sunburn when used correctly.


Reducing Skin Cancer Risk

Regular use of sunscreen with adequate SPF reduces the risk of developing skin cancer, including melanoma, which is the deadliest form. By protecting the skin from harmful UV radiation, SPF helps in preventing DNA damage that can lead to cancerous changes.


Preventing Premature Aging

Exposure to UVA rays accelerates the aging process of the skin, leading to wrinkles, fine lines, and age spots. SPF provides a barrier against these rays, helping to maintain youthful and healthy-looking skin.

Sunscreen | Image: Freepik

Usage of SPF

Choosing the Right SPF


The American Academy of Dermatology recommends using a broad-spectrum sunscreen with an SPF of at least 30 for daily use. For prolonged outdoor activities, higher SPF levels can offer additional protection.

Application Guidelines


For effective protection, apply sunscreen generously to all exposed skin areas about 15-30 minutes before going outside. An average adult needs about one ounce (a shot glass full) to cover their entire body. Reapply every two hours, or more frequently if swimming or sweating, to maintain protection.

Additional Measures


While SPF is crucial, it should be part of a broader sun protection strategy. Wearing protective clothing, hats, and sunglasses, and seeking shade during peak sun hours (10 a.m. to 4 p.m.) can further reduce UV exposure.

Importance of SPF in Summer

During summer, UV radiation levels are at their highest due to the sun’s position. This increases the risk of sunburn and skin damage. Using SPF becomes particularly important in summer to mitigate these risks.

Outdoor Activities


People tend to spend more time outdoors during summer, engaging in activities like swimming, hiking, and picnics. These activities increase UV exposure, making SPF essential for protecting the skin.

Water and Sweat Resistance


Opt for water-resistant sunscreens during summer activities involving water or heavy sweating. These formulations adhere better to the skin, providing more reliable protection.

Daily Use


Even on cloudy days, up to 80% of UV rays can penetrate the clouds. Incorporating SPF into your daily routine ensures consistent protection against UV radiation.


Published May 26th, 2024 at 16:14 IST