No matter what the weather is or time of year keeping hydrated is essential. Drinking plenty of water even when you don't think you need to. At least 2 litres a day is advised. It will prevent tiredness, headaches and helps keep your skin clear. Ensure the water is clean, if it is in a plastic bottle do not re-fill it or leave it in the heat, the chemicals produced are not good for you. Be careful not to drink too much because that can be worse that not drinking enough.
SPF Number Meaning
Until last year this was brand new information to me. The higher the number, the higher the protection? No. It seems logical that SPF 30 is twice as good as SPF 15. The factor is used when referring to UVB rays the sunscreen blocks. SPF 15 blocks 94%, SPF 30 blocks 97% SPF 45 blocks 98%. In the long term a higher SPF will help to prevent skin damage but on a day to day basis there is not a whole lot of difference in what number you use. I personally use SPF 20 on my face and body.
I think we are all guilty of not following this rule, it is important to reapply at least every 2 hours. Regardless if you are swimming or not. It will wear off sooner than you think and to ensure protection at all times reapplying is all you have to do. Especially if you are outdoors for a long period of time.
In the same way we should only use make up and skincare products for a certain length of time the same goes for sunscreen. Check the bottle for the expiry date. Typically they should last 3 years but it may differ from product to product. If in doubt buy a new one every summer, if you're like me you probably lose the one you had last year.
Make sure you stay safe so you can have fun out in the sun and not spend hours or days feeling uncomfortable. Your skin will thank you in the future.