This long sleeve t-shirt blank is the Comfort Colors 6014 Heavyweight Adult Long Sleeve Tee in Ivory

From the manufacturer:

• Comfort Colors styles are garment dyed for that lived in feel and almost no shrinkage at home
• Made with 100% soft ring spun U.S. cotton fabric and cotton threads
• Topstitched, classic width, collar
• Twill taped neck and shoulders for comfort and durability
• Rib cuffs
• Relaxed fit, seamless body
• Signature twill label and shoulder to shoulder twill tape
• Proud member of the U.S. Cotton Trust Protocol
• Made with OEKO-TEX certified low-impact dyes
• Our clean pigment dye colors are salt free