SPF, or Sun Protection Factor,is a factor that defines how well a sunscreen can protect skin from harmful UVB rays, this kind of radiation can cause sunburn, damages skin, and can cause to skin cancer.
Basically it is used for your skin which would normally burn after 10 minutes in the sun, so after application of an SPF 15 sunscreen can help you to stay in sun without burning for approximately for 150 minutes (a factor of 15 times longer).
This is a rough estimated value that mostly depends on skin type, intensity of sunlight and amount of sunscreen used.
Clarins Sun Care Cream-Gel UVA/UVB (£19 for 200ml) – best for combination skin
Neutrogena Ultimate Moisture Day Cream (£7.99 for 50ml) – best for dry skin
Simple Sun Sensitive Protecting Suncare Lotion UVA/UVB (£5 for 200ml) – best for sensitive skin
Lovea Sun Care Protection UVA/UVB (£11.99 for 125ml) – best for organic beauty fans
Piz Buin Ultra Light Dry Touch Face Fluid UVA/UVB (£12 for 50ml) – best for under makeup
Soltan Face Moisturising Suncare Cream UVA/UVB (£9 for 50ml) – best for dry skin
JĀSÖN Sunblock UVA/UVB (£10.20 for 128ml) – best for natural skincare fans
Green People Sun Lotion UVA/UVB (£17.05 for 200ml) – best for unscented
Eucarin Sun Fluid Mattifying Face UVA/UVB (£15 for 50ml) – best for combination/oily skin types
Korres Yoghurt Sunscreen Face Cream UVA/UVB (£16.50 for 50ml) – best for sensitive skin
John Masters Organics Natural Mineral Sunscreen UVA/UVB (£28.50 for 59ml) – best for dry skin
Murad Oil-Free Sunblock UVA/UVB (£24.30 for 50ml) – best for a matte finish
RMK UV Face Protector UVA/UVB (£23 for 35ml) – best for a lightweight formula
L’Occitane Angelica UV Shield UVA/UVB (£26 for 30ml) – best for dull skin
Jack Black Oil-Free Sun Guard UVA/UVB (£14.50 for 118ml) – best for sweat/water resistant
Laura Mercier Daily Face Shield UVA/UVB (£27 for 30ml) – best for under makeup
La Roche-Posay Anthelios XL UVA/UVB (£16.50 for 50ml) – best for a lightweight formula
Ole Henriksen Protect The Truth Sunscreen UVA/UVB (£31 for 60ml) – best for repairing existing damage
Soap & Glory Make Yourself Youthful Sunshield Superfluid UVA/UVB (£15 for 30ml) – best for a matte finish
Bioderma Photoderm Max Ultra-Fluid UVA/UVB (£15 for 40ml) – best for combination skin