Favourite pair of lululemon leggings

I’m looking to Buy some Lululemon leggings but I’m just not quite sure which ones to buy because they have so many to choose from. If anyone has any recommendations on which lulu leggings they cant live without please share! Im want them to preferably not be see through, black, full length and comfy. I would probably just wear them for running around and going to school in not any intense activities! Im 15 and I dont want to spend money on something that I wont really enjoy. Thank you kindly!