AT's are "All year round tyres" they are what Land Rover fit as OEM on Defenders - OK not the same vehicle, I ran 58000 miles on the 1st set of BFG AT's on my Defender, I'm now running MTR's on it. However I ran my RRS for one week in July last year on my Pirelli Snow and Ice winter tyres after shattering the NSF tyre and wheel and tore open the NSR Pirelli Scorpion Assymetricos on a large pothole when I hit it at 60. After a motorway drive to London and back there was very visible wear on them after 1100 miles even though it was not the warmest weather BUT on the Shap section of the M6 when it was like driving on a canal the grip was fantastic when all around were aqua-planing like mad! The compound becomes very sticky in warm weather when you run winter tyres out of season and you get accelerated wear on them 2018 Mini Countryman Cooper S E All4 PHEV in Melting Silver - it’s whisper quiet in EV and polluter modes