Hair: At the Blue Lagoon, you can't get your hair wet, due to the mineral rich waters. At the Sky Lagoon, however, getting your hair wet is encouraged.
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In fact, you can always touch the bottom of the lagoon standing up, so it is not like a swimming pool. The milky-blue depths aren't clear either, so you only really want to stick your head under the water to keep warm or perhaps wash off your mud mask.
No, it is not harmful. Geothermal seawater contains high concentrations of minerals, such as sulfur, silica, and magnesium. While these are great for your skin, they can leave your hair feeling dry and matted.
To fit in with the locals, it's best to be barefoot at the Sky Lagoon. Outdoor shoes are not permitted around the lagoon to protect the floor from bacteria and dirt. It is possible to wear flip flops, which some visitors prefer to do, especially in the winter months when the ground is cold underfoot.
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.
The fact of the matter is that Blue Lagoon's water does in many cases make your hair quite weird. The minerals in the water will coat each and every hair making it stiff and feel dry even though it isn't really.
The Blue Lagoon water has high levels of silica. Silica is not harmful to hair. However, if you get your hair wet from the water, it can become stiff and difficult to manage. We highly recommend you apply conditioner to your hair and leave it in while you bathe.
Are swim suits required at the Blue Lagoon? Bathing suits are worn in and around all areas of the bathing lagoon, including the sauna. You can bring your own, or rent them from reception. You can also rent towels and bathrobes.
Depending on your hair type and how sensitive you are, you might want to use a shower cap or keep your head and hair out of the water. The Silica in the water is not harmful to your hair, but it can get stiff and difficult to manage. There is conditioning in the showers to help, but it might take a few washes.
The Blue Lagoon was named because the water of the lagoon looks blue when reflected from the sun but in actuality, the water is a milky white color. And don't worry about the smell, the sulfur has been removed so there is no funky smell at all anymore.
Unlike boring old regular geothermal water, the composition of the Blue Lagoon is unique—you won't find it anywhere else in the world. It's home to a couple of algae plants also not known to exist elsewhere. This combination has been found to have a number of proven beneficial effects on skin.