I have super straight hair and the only curl it will hold is with one of those three prong slightly-less-intense-than-a-crimper things... if you do it lightly it makes quite nice beachy waves and it’s fairly quick
I bought some curling pods having failed miserably and trying curls with straighteners and heated rollers . I put them in most weeks now they are ace ! Pop about 12 in to dry hair .... roll up and pop closed . I leave for about 20 but work in less .
Once out they look really tight and almost too curly but I run my fingers through and my fine limp hair is honestly full thick and I love it ! Sometimes I just put the pods in half way down too x