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So, I don’t know where you are, but my mom always used to get me the plastic mattress covers that zip all the way around for the cheapest. (Something like this https://smile.amazon.com/dp/B0033RO2OW/ref=cm_sw_r_cp_api_glt_fabc_XKDRCHRC131RSS6K4HCH?_encoding=UTF8&psc=1)They were varied brands (all bought at Kohl’s) and they seemed to work alright. I think the more important thing with those is to make sure to change them out semi-regularly (we’d do it after every school quarter ended). I have a bunch stockpiled so I haven’t had to find any yet, but those seemed to help me the best.
Something else to be wary of is just to watch all scents that are near him. Like, I can’t do anything really floral, so like, my mom would always buy us all a clean smell or brown sugar smelling deodorant.