@xcDOGS Thanks for reaching out!
We apologize for the confusion on this product information. To clarify: you are looking at the size chart at the bottom of the product page that lists different inseam lengths? These rain pants have an inseam of 36". The size chart at the bottom of the page is the general measurements for REI apparel, but does not always apply directly to products that are specifically calling out a different measurement, such as the 36" inseam pants you are looking at.
As such, the men's medium in these pants should have a 36" inseam.
Hopefully this helps, thanks!