Stay away from Eyekonik Eyewear.
The sunglasses feel very cheaply made and seem to be made of low-quality plastic. For the price, I expected much better quality.
What is particularly frustrating is the return policy: even though the shipment is within the EU, you still have to pay the return shipping costs to Germany yourself. In my case, this was around €18, which I consider very customer-unfriendly.
Overall, I am very disappointed and would not order from them again.