Composition: 100% Cotton (organic). Scroll for more detail →. US 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10. EU 35.5 36 37 37.5 38 38.5 39 39.5 40 41 42. UK 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8. Shoes & Boots. cup size A A/B B B/C C C/D D D/DD D/DD D/DD D/DD D/DD.