Side-Seamed (not tubular). What does this mean? There are two basic types of construction when it comes to a basic tees: side-seamed and tubular. Tubular tees are cheaper to construct because they require less sewing. But while you may shave some pennies off the price, tubular tees don't really fit right on people because our bodies aren't tubes.On the other hand, side-seamed tees create the tailored structure a tee needs to fit correctly. Although more expensive to make, these are the only type of tees you'll find in a retail store.