J.VERMen's Long Sleeve Stretch Dress Shirt Non Iron Casual Business Formal Shirts S-6XL

Where is the size chart

Hello, these shirts are amazing! I was wondering how I should wash the shirt (temp and runtime), will I be able to iron or tumble dry it?

What size would I need to order for 20” neck ?

What Chest size and Collar size are the Large and XL sizes?