From the brand

Product description

1-Fingd a thin screw-driver or nipper,opening the groove-door at the back of buckle,

2-Taking the strap out from the buckle;

3-Cutting the strap for your desired size,

4-Putting back the sized strap into the bukcle and close the groove.

For a 42” waist which is better the 36-42 or the 38-44?

We recommend that you can buy a larger size, and as our waistbands can be trimmed, you can always cut off more.
How quickly can I adjust my belt when I sit down?

just lift up the front face of the buckle to release and the get the belt through, and release your hand then it goes back automatically to lock firmly, more comfortable, simple and durable;
Will the belt set off metal detectors? Are they TSA approved?

Yes, they are subject to setting off metal detectors and are not TSA approved. We advise you to remove your belt and wallet before going through the metal detector.
What is inside the package?

Package: 1*gift box, 1*metal buckle, 1*genuine leather belt, 1*operating guide.