There is a double layer inside at bottom of panties (gusset). What

There is a double layer inside at bottom of panties (gusset). What is it meant for? Some of them are open from the front side (inside) and that is very irritating.

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There is a double layer inside at bottom of panties (gusset). What is it meant for? Some of them are open from the front side (inside) and that is very irritating.