Barefoot alternative sandals D.D. Step are suitable for narrower feet, medium instep. Leather snadals are very flexible, low weight.
Materials:
shoe upper - leather
lining - leather
outersole - rubber
Inner length in mm (measured with Plus 12) a width in mm (measured with Clevermess):
20: 129
21: 136 / 58
22: 144 / 60
23: 151 / 62
24: 157 / 64
25: 164 / 66