MODULAR menstrual panties for heavy flows Slip-Slap EVOLUTION = 1 brief + 2 inserts + 1 double pouch Slip-Slap Evolution was designed for women who like the comfort of menstrual panties but want more absorbent protection and the ability to change easily during the day. Our menstrual panties have gussets to hold the pads (or inserts) which act as boosters to multiply the absorption of the panties. Worn without a pad, the Slip-Slap EVOLUTION panties will be sufficient for a light to medium flow. The high waist has a sculpting effect and is adorned with magnificent recycled lace. It can also be used postpartum. Slip-Slap EVOLUTION comes in a nice double pouch to separate clean and used pads.