The best system out there is Gore's suppressent. The reason being is that the carbon is placed in the woven wind proof liner and will not come out in washings according to their literature. I own scent lok, scent blocker, and suppressent and by far the best material is the suppressent. Studies show that if the wind can't get through it won't let your scent out and the carbon absorbs it too. The only problem is that it is very hot. It is next to impossible to wear it out to the stand without breaking out in a sweat. It would be best to carry it to the stand and put it on out there. I bought the liner system from the REDHead catalog in the supressent for late season hunting. It is very warm and I do not recommend it for warm hunts.