I recommend a long-lasting eyeliner for summer.

This is the product called the Bbia Last Pen Eyeliner! It comes in black and brown, but I like the brown one better, so I only use that one haha. It is an eyeliner that absolutely does not smudge, no matter how much I sweat or get wet haha. It doesn't clump on the eyes and isn't heavy or cakey at all; it's really great! I highly recommend it.