A "Floral Poplin Smock Tier Tie Back Maxi Dress" is a type of dress typically made from poplin fabric, which is a durable, tightly woven cotton fabric known for its smooth texture and lightweight feel. The dress likely features a smock-style bodice, which is gathered or elasticized, creating a loose and comfortable fit around the chest and waist.

The "tier" refers to layers or tiers of fabric that create a flowing, tiered skirt, adding volume and movement to the dress. The "tie back" detail suggests that the dress has ties or straps at the back, allowing the wearer to adjust and customize the fit around the waist or upper back.

Overall, this dress combines a comfortable, relaxed silhouette with a feminine and romantic floral print, making it suitable for various occasions, from casual outings to semi-formal events.