Fruit of the LoomWomen's No Show Seamless Underwear, Amazing Stretch & No Panty Lines, Available in Plus Size

How wide are the sides on the bikini?

Are they truly seamless? I have to wear leggings a lot as I am a dance instructor and I do not want party lines showing!

Does this have a cotton or nylon liner? Need nylon for my Mom if anyone knows who has them please ty so much

how do you wash it?