On Thursday 25 July, the UK recorded its hottest July day in history, with a new record temperature of 36.9C being logged in Heathrow, London.

While many may shy away from the heatwave, opting to stay in doors with an ice-cold drink and a cooling fan constantly at their side, others may choose to head outdoors and bask in the sunshine.

If you're one of the latter, then it's essential that you have a constant supply of suncream at hand, so that you're ready to top up your sun protection on a regular basis.

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However, with so many different types of suncream on the market, it can be difficult to decipher which are actually providing your skin with an adequate degree of protection.

Here's everything you need to know about suncream, from knowing which brands will protect you in the water to understanding the difference between UVA and UVB rays:

What are UVA and UVB rays?

UV (ultraviolet) rays are a form of electromagnetic radiation which comes from the sun, the American Cancer Society explains.

There are three forms of UV rays – UVA, UVB and UVC.

UVA rays emit the least amount of energy of the three types of UV rays, causing the skin to age and potentially leading to some skin damage.

UVB rays emit more energy than UVA rays, and can cause direct damage to DNA in the skin cells, resulting in sunburn. 

According to the American Cancer Society, UVB rays are responsible for the majority of cases of skin cancer.

Meanwhile, UVC rays emit the most amount of energy of the three types of UV rays. 

"Fortunately, because of this, they react with ozone high in our atmosphere and don't reach the ground, so they are not normally a risk factor for skin cancer," the American Cancer Society states.

When buying a suncream, you want to make sure that you purchase a broad-spectrum product that protects you from UVA and UVB rays.

If a suncream has "UVA" written on the bottle in a circle, then this indicates that it meets the EU standard for protection against UVA rays.

Some products may also include a UVA star rating from one to five, the latter indicating the highest level of protection.

The NHS recommends buying a suncream with a sun protection factor (SPF) of at least 30 to protect against UVB rays, and a minimum four-star UVA protection.

What is SPF?

SPF measures the amount of protection a suncream can provide you against the sun's UVB rays.

It is rated on a scale from two to 50+. The higher the SPF number, the stronger the protection you'll have.

SPF provides you with an insight into how much longer it will take for your skin to turn red in response to UVB rays in comparison to if you weren't using any protection at all.

Therefore, if you would normally start burning within 30 minutes without sun protection, then a suncream with SPF 30 would theoretically provide you with 30 times more protection, which equates to 15 hours of protection.

However, this relative measure does not mean that you should go 15 hours without reapplying suncream, as suncream can come off by being dried by the sun or coming into contact with water.

"No suncream, regardless of strength, should be expected to stay effective longer than two hours without reapplication," states the Skin Cancer Foundation.

The NHS recommends reapplying suncream at least every two hours, suggesting that children and adults use a suncream with a minimum SPF of 30.

NHS recommends using suncream with minimum SPF 30 (Getty Images/iStockphoto)

How much suncream should you apply?

The NHS warns that if suncream is applied too thinly, then the amount of protection that it is able to provide will decrease.

According to the NHS, adults should use approximately two teaspoons of suncream if they're exposing their head, arms and neck to the sun.

However, if they're wearing a swimming costume, adults should aim to use two tablespoons of suncream.

Adults in the care of children should make sure that any area of skin that is exposed to the sun is covered in suncream.

Different types of suncream

Some suncreams claim to only be necessary for use once a day, while others state that they are water resistant.

Here's everything you need to know about the various forms you can find:

Once-a-day suncream

According to research conducted by Which?, suncreams which claim to only require application once a day do not provide a sufficient amount of protection.

Therefore, consumers are advised to not rely on a suncream which states that it only needs to be applied once a day.

Applying suncream once a day is not recommended (Getty Images)

Water-resistant suncream

Water-resistant suncream is especially ideal for those spending time in the pool or sea this summer.

It does exactly what it says on the bottle – provide you with sun protection while you're in the water.

However, you must not assume that this protection will continue when you're out of the water.

Even if you're using a water-resistant sun cream, you should still reapply once you're back on dry land.

Suncream with insect repellant

While suncream which contains insect repellant may sound appealing to those who want to ward off any pestering bugs, it may not be advisable.

The Centres for Disease Control and Prevention (CDC) recommends using suncream separately to insect repellant.

"In general, travellers typically need to apply sun protection more often and in larger amounts than they do insect repellant," the CDC states.

The organisation adds that limited studies have shown that when insect repellant products containing DEET (diethyltoluamide) have been applied over suncream, this can reduce a suncream's SPF by a third.

It is therefore recommended to apply suncream first before then using a separate insect repellant.

Facial suncream

Skincare brand La Roche Posay explains that facial suncreams are made to feel "comfortable to wear" on the face, with "textures that are lighter and more easily-absorbed than suncreams for the body".

The company outlines how facial suncreams are designed to not feel greasy, to not clog the face's pores and can be catered for specific skin types, such as for individuals with dry or oily skin.

Suncream for babies and children

The NHS recommends keeping children aged under six months out of direct sunlight.

From between the months of March and October in the UK, children should wear clothing that covers their skin adequately, be kept in the shade from the hours of 11am and 3pm and wear suncream which has a minimum of SPF 30.

Suncream shelf life

The majority of suncreams have a shelf life of between two and three years.

So, if you're packing for a holiday and discover a dusty bottle of suncream at the back of your bathroom cupboard, it would be a wise course of action to swap it for a new one.

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Looking for more information on which suncreams you should be buying this summer? Check out our IndyBest reviews below:

For the best suncreams for children which are high in SPF, easy to apply and water resistant, click here.

For the best body suncreams for SPF and UV protection that lasts, click here.

For the best suncreams for babies that will protect their sensitive skin, click here.

For the best eco-friendly suncreams, click here.

For the best anti-ageing suncreams, click here.

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