My hair is very straight and shoulder-length (grown-out bob). When I wear it down, it seems okay, but if I tie it up (ponytail), within about 30 minutes I have a mass of shorter hairs sticking out around my hairline. I don't know why but they don't seem to be visible when my hair is down. I don't usually use hair-product so don't really know the difference between the various types, and can't really have a mooch round the shops, so can you recommend anything to keep the fine hairs in place/tamed? I'm getting a bit tired of looking like a daisy on video calls.