Can I just bring an umbrella?

No. The wind in Iceland will destroy an umbrella in seconds. Stick to hoods and waterproof gear.

Do I really need expensive hiking boots?

Yes. The terrain is volcanic, jagged, and wet. You need ankle support and a rigid sole that won't flex on sharp rocks.

How to Master the Layering System for Iceland

Dress in three distinct layers: a moisture-wicking base, an insulating mid-layer, and a completely waterproof/windproof outer shell. Never rely on one thick coat, as you will need to shed or add layers multiple times throughout a single hour.

Select your base layer. Avoid cotton entirely. Use merino wool or synthetic thermal tops and bottoms. These pull sweat away from your skin, which is essential because if you get damp and the wind hits you, you will get hypothermic quickly.
Choose your mid-layer. Bring a fleece jacket or a lightweight down 'puffy' jacket. This layer traps your body heat. Keep it compressible so you can stuff it into your daypack when you're hiking and working up a sweat.
Prioritize your outer shell. This is your most important purchase. Your jacket and pants must be rated as 'waterproof' (not water-resistant). Ensure they are seam-sealed. If the label says it breathes but won't stop a gale-force wind, it is not for Iceland.
Protect your extremities. Pack two pairs of wool gloves: a thin liner pair for dexterity and a heavy waterproof pair for outer protection. Always carry a beanie that covers your ears, even in summer.

Can I just bring an umbrella?: No. The wind in Iceland will destroy an umbrella in seconds. Stick to hoods and waterproof gear.
Do I really need expensive hiking boots?: Yes. The terrain is volcanic, jagged, and wet. You need ankle support and a rigid sole that won't flex on sharp rocks.