Vivobarefoot
Excellent barefoot biomechanics with a handful of promising natural-material casual models, especially the Gobi Sneaker Premium and its 98%-natural styles.
Not a brand-wide clean pass. Screen out the recycled-polyester, synthetic-rubber, PU-foam and membrane styles; include only checked SKUs.
A US source in the The Second Skin directory. Check that it ships to Europe; where it does not, the directory lists a European alternative alongside it.