Food-Grade EVA Wrap in Mats

Just wondering if you have any opinions about "food grade EVA" found in the wrap-in-mats. I bought one for my son for his lunch bag and am now wondering about the inner lining of EVA touching his food. I'm considering purchasing another (for snacks) but am a bit put off by the lining. I'd love to know what you think about it and if you think it is "safe" to use.