Chabad Woolen Tzitzis. The size is equal to the width of the tzitzit in the front (i.e. size 8 would be approx 8 inches across). Below is an approximate sizing chart for your convenience.
- Size 8= age 2-4
- Size 10= age 3-5
- Size 12 = age 5-7
- Size 14 = age 7-9
- Size 16 = age 10-12
- Size 18 = age 12-14 (according to some this is big enough for an adult {Bar Mitzvah} but according to R' Chaim Na'a you would need a size 20)
- Size 20 = small adult
- Size 22= med
- Size 24 = large
- Size 26 = XL
- Size 28= XXL