I found it is best to have a mild amount of ambient lighting in the room you are playing in. Genius! I really hate writing "bad" reviews but this product unfortunately did not meet my expectations. I called Amazon and they took this model pair back and sent me another pair. I have found much comfort with the Naot shoe line and this is the shoe that I would recommend. So they are basically unusable right out of the box. Not super fitted, but not oversized either. This causes the folding process to be extremely hard s there is still air in chambers 123and 4. So the seller must not have control over their part numbers. The green ones are 39 and they shrank quite a bit due to unpredictable Colorado weather, so I?ve ordered size 40 and they perfectly fit for my wide feet!