"Tubular" means that the body of the shirt is one piece, as opposed to side seamed.
"Jersey" is the common term used for t-shirt fabric. Polo shirts are commonly known as "Knits" and button downs are commonly known as "Wovens."
"30/1," or also known as "30 singles" refers to the tightness of the weave of the fabric. The higher the number, the tighter the weave and that typically makes for a softer and/or thinner shirt. A standard 6.1 oz t-shirt is usually 18 or 20 single. Premium or fashion fit 4 oz shirts are typically 30 or 40 single.
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