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The Primus Lite Bio men's are my first pair of Vivos. I have found them to be soft and supple but also solid for light walking or play, especially on grass. They breathe very well and fit perfectly. My feet are narrow to medium-narrow (B_D-) and the 44 with a light to medium sock gives enough range for varying temps. The lacing allows for a nice no-sock fit as well with extra 'more than a thumb' length. I am usually a 10.5 to 11 US, and the 44 EU for the Bio is right in this range. They have been so much fun to wear i am looking for other Vivos.