Hi Anthony and welcome. Yes, this holster fits up to a 1.5-inch belt maximum. It will work no issue. Cheers and stay safe!

yes it fits from 1 inch to 1.5 inch belts see *****Keep A Low Profile With The Mission First Minimalist Holster
Mission First's Minimalist is a sleek streamlined holster that provides all the security and comfort of a standard sized holster. Designed to be work in the appendix or 5 o'clock position this holster is fully ambidextrous and features a claw that keeps the heel of the firearm pressed into your side creating an extremely concealable firearm. *******This holster accommodates all belts up to 1-1/2 inches wide and is made from a durable polymer for a life time of use.
Specifications and Features:
Mission First Tactical: H2SWSHAIWBM
Inside Waistband Holster
Adjustable Cant
Constructed From Polymer
Color: Black
Fits:
Smith & Wesson M&P Shield 9/40