Sizes: There are three sizes for menstrual cups which fits best the various physical features of the vagina based on anatomy and age: SIZE SMALL (S) : For women with a low cervix or teen. Capacity-25ml SIZE MEDIUM (M) : For women under 30 or who have not given birth. Capacity- 29m1 SIZE LARGE (L) : For women over 30 or who have given birth. Capacity -36m1 Using the Cup: Sterilization: At the beginning of each menstrual cycle, always boil the device in bubbling-hot boiling water for 5-7 minutes and then use. After the cycle is complete, please sterilize once again as above and keep inside the carry pouch. The cup is inserted into your vagina where it collects menstrual flow. Once in 12 hours or as and when you feel it, you remove it, empty the cup, wash it out, and then reinsert it. While those are the basics, there are more details of how to use menstrual cup to help you be prepared for your first-time use. Step 1: Fold and Hold Begin by washing your hands. Then take the cup's walls together and fold it into the shape of a C. For most women, this C shape will make the menstrual cup easiest to insert. Keep in mind, however, that every woman has a slightly different anatomy so there may he a different fold shape that is more comfortable for you. Step 2: Keep the Pelvic Muscles Relaxed If your pelvic muscles are tensed, you will find it more challenging to insert the cup, or it may even be painful. It can sometimes help to practice kegel exercises as this lets you relax your pelvic muscles on command, such as when you are inserting the cup. Be patient and remember that the cup will be hardest to insert the first time. If you become frustrated, take a break and then try again.