Windsurfer, I've just spotted your query. I'm the bloke responsible for Members' Benefits, and we do get some additional Club benefits from Avon. As well as the technical guide they wrote for the Club, but now share with Caterham, which you can find here:- /guides/avon-tyre-information They also give us a contact number, which they are happy for members to phone, which can be found in the Members' Benefits section here:- /membership/special-offers-members/avon-tyres Anyway, having seen your post, I took the liberty of phoning Adam at Avon Motorsport, myself. Adam says that ZZS does not have a temperature sensitive compound. He did, however, say that speaking entirely personally, he wouldn't like to think of his own tyres being in a frozen container for any great length of time. I asked if they had a North American distributor that you could buy from, thus obviating the need for you to have them shipped out at prolonged low temperatures. Adam suggested you might like to try Roger Kraus Racing, who are one of Avon Motorsport's US distributors. Here's the link:- https://rogerkrausracing.com/ Good luck. I hope you can get it resolved satisfactorily.