This topper fits only the H2.0 version of Stanley in 30 or 40oz, or most knock off styles of the 40oz Stanley. Choose your colors from the last few photos of options and leave it in the notes along with the personalization. If it doesn’t fit correctly at first try pulling your straw up to straighten it, sometimes the angle of the straw prevents it from sliding down in to place when first putting the topper on.