OOMYO long special for yoga practice leggings is made with a special opening on your heel. So it does not roll up and your feet feels comfortable. Also if you are not in a mood for trendy yoga leggings, you can always pull it up and have leggings with legwarmer. Our brand is focused on natural, comfortable to use material –viscose. Really soft 92% viscose and 8% of elastane. Machine washable.