@discographer-- Some of the newer incontinence underwear with built-in padding do fight odor. The pad is made of materials that is meant to lock in liquid and odor. But I agree with you that this is an issue with many products.
It's very difficult to find the best incontinence underwear. The ones with thick, bulky pads look funny under clothes and are uncomfortable. The ones with thin pads are comfortable but only offer minimum protection. Someone with heavy incontinence won't benefit from them.
It's a good idea to do some research on the various types of incontinence underwear out there before settling on one. They're not cheap so it's nothing something that most people can buy ten pairs of.