Why does the Logical® Sleep Mask only need such light strap pressure?
Most masks seal around the outside edge of the mask, a linear distance of up to 20cm. Generally, the larger the sealing area, the more strap pressure is required. With the Logical® Sleep Mask the sealing area is only the size and shape of your nostrils. The straps are primarily there to prevent the mask from being pulled off your face during movement whilst sleeping.
