UVA RAYS: UVA rays account for up to 95% of the sun’s UV radiation reaching the Earth’s surface. These rays penetrate the skin deeply and cause several issues such as skin ageing, wrinkling, tanning and some in some cases, even skin cancer. UVB Rays: These rays are known for causing damage to the epidermal or superficial layers of the skin. It is known to cause skin reddening, sunburns, photoageing and skin cancer as well. These rays can burn and tan your skin all year round. SPF: Sun Protection Factor refers to the amount of protection a sunscreen lotion offers mainly against UVB rays. Sunscreens with SPF 15-30 roughly offer 93-98% protection against sun damage. PA: This denotes the amount of sun protection a sunscreen offers against UVA rays. These are labelled as ‘PA+, PA++, PA+++’, referring to the intensity of the protection against UVA rays.