Swimwear is required to enter the water at the Sky Lagoon, though you can hire a bathing suit if you forget to bring your own. Towels and dressing gowns can also be rented. If it's a very cold day you could benefit from wearing a hat in the water.
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Remember your locker number! Next step is to get naked and shower as showering in the nude is required before entering the Blue Lagoon pools (and all public pools in Iceland). So you will want to take off your clothes and grab your towel and swimsuit and head to the shower.
If you book the Premium or Luxury packages, then your entrance also includes a bathrobe. If you have your own towel (or bathrobe), you are welcome to bring it to the Blue Lagoon to use. However, we recommend just using the free towel provided as otherwise you will have wet towels to take home with you.
Sky Lagoon or Blue LagoonThe reason for that is simple – in all the swimming pools and paid hot springs in Iceland is mandatory to take a shower naked, before you enter the pool.
The sky lagoon is open until 10 pm in the evening. The evening is generally more crowded than mornings, but with little views, aside from possible northern lights in winter. Opt to come around sunset instead.
A few smaller differences: the Sky Lagoon is smaller while the Blue Lagoon is massive; you can get your hair wet at the Sky Lagoon but you can't at the Blue Lagoon; both are good for photography; the Blue Lagoon has face masks and spa services while the Sky Lagoon does not. Is it worth going to both?
Sandals have virtually no use in Iceland, even in summer when the average temperature hovers at just over 10° Celsius. The one exception to this is on multi-day hikes, such as the Laugavegur Trek from Þórsmörk to Landmannalaugar, which will require you to cross rivers on foot.
No, you shouldn't put on makeup to bathe in the Blue Lagoon, as the water could get dirty. In fact, this is one of the main reasons why it's mandatory to shower before entering the Blue Lagoon.
There are instructions on the locker door as well. It is recommended that you leave all your jewelry and watches in the locker and the water might cause some damage to them. After having fun with the locker, you will need to shower before going into the lagoon. It is compulsory to shower and wash with soap.