I've never used an IR product, but last summer I bought the Kokatat Tropos material Helix top (Kokatat Watersports Wear - Helix Dry Top
) and it's been great. After a few months it felt like I was getting unreasonably wet. So I sent to to them and they fixed it free of charge. (apparently the tape under the arm wasn't sealed correctley) It has worked great ever since.
when I was looking for my new top I really didn't even consider any other brand because i had been using a Kokatat since I started that my dad bought. It's over 15 years old and still kept my warm.
One more thing that i think is sometimes overlooked is that I would make sure the part of the double tunnel that is touching your body is cinched up. When mine is it works way better. Hope this helps.