This design has the added bonus of limiting the extent to which the shape, as seen from the outside, doesn't look like a firearm, thus, enhancing conceal-ability. The holster has an outer surface with more friction than the inside so that drawing the gun will be unlikely to drag the holster with it allowing for a clean and fast presentation of the firearm.
Basic Size Chart-
Size 10 Fits J Frame 340PD LCR Gl2627 S&W Shield or similar
Size 11 Fits LCP Kahr P380 Keltec P32 3AT Diamond Back .380 or similar
Size 12 Fits LCP P380 Keltec P32 3AT, with Crimson Trace Laser or BodyGuard 380 with InSight laser or similar
Size 13 Fits Kahr MK9/40 Kel Tec PF9 or similar
Size 14 Fits Bersa 380 SSP380 or similar Size 15 Fits Be2125 Tomcat SW950 Guardian Seecamp or similar
Size 16 Fits Taurus Judge Public Defender
Size 17 Fits Kahr P380 Kimber Solo
Size 18 Fits Kahr P380 with Crimson Trace Laser
Size 19 Fits Glock 42 MK9/40 Kel Tec PF9 with Crimson Trace Laser
NEW*** Size 43 Fits Glock 43 ** Beretta M1934
Size 49 Fits: Ruger LC9 SR-9C, Kahr P230, CW9, CW40, P9, P40, PM9, PM40, TP9, TP40, PM45, TP45, CW45, P45, Kimber Solo PF9 Glock 19, 23, 25, 26, 27, 28, 32, 33, 36, 38, 39, Taurus Slim, 708, 709, 740 Sig Sauer 238, Keltec PF9 With CRIMSON TRACE LASER
So Many Fits- Size the Size Chart in the Images above.