This is a Tagua Inside Waistband Holster known as the Nylon Four-In-One Holster, model NIPH4-635.
The Black Nylon 4-IN-1 Open Top Holster is a four way inside the pants nylon holster with an additional 3 ways to carry on your belt. The main feature is the feeling of not carrying extra weight while concealing. Its multi-fit design covers a wide range of guns.
Features:
Inside the pant holster
Three additional ways to carry on belt
Right handed
Fits Springfield XDS