The Swift FX's dual-wall pillows, with trampoline action on a flexible cushion base, maintain a secure seal while adapting to your natural movement through the night; as well as side sleeping.
SIZING: Four pillow sizes are available -- ExtraSmall, Small, Medium, Large -- and all four pillow sizes are compatible with all Swift FX Series Nasal Pillows Masks.
Swift FX and Swift FX Bella Gray Masks come standard with Small, Medium and Large pillows. Swift FX For Her and Swift FX Bella Mask Packs come standard with ExtraSmall, Small, and Medium pillows.
NOTE: While the fittings are compatible, Swift FX Nasal Pillows are NOT recommended for use with Swift FX Nano Masks. This is due to subtle differences in the mask design required to position nasal pillows properly against the face.