Have tried and tested many boots to fit over my leathers, used to have the RST evo tech's but they are just made for skinnier legs. These Alpinestars boots have been a dream, the zip does up fully over my leathers, they've been comfortable to break in and not too stiff (I went with my normal everyday shoe size, no sizing up), have walked quite a lot in these at bike events and have had no issues of blisters or overheating. Highly recommend