Condom sizes

OK so this is kind of a weird question but I need to know. I am pregnant now so we are not using condoms but after she is born definitely going to need protection. We've had a problem with condoms in the past they always leave a purple ring on my husband it doesn't matter if they say they're bigger not they always leave this ring and they irritate him. We have to use latex free can someone recommend us something please & thank you.