word request - What is the brown cardboard covering coffee cups

I recently got into an awkward situation when I wasn't able to ask for a 'warmth protector thingy' in Starbucks, and wasn't accurately able to describe it, so could someone tell me what you would c

22+ Coffee Cup Mockups

DOWAN 20 oz Coffee Mugs, Christmas Mugs with Word Blessed Grateful, Large Porcelain Coffee Cup, Thank you Thanksgiving Christmas Gift for Women Men Christian, Set of 2 : Home & Kitchen

Beverage Box- Lemonade-BEV- 4

Printed Coffee Cup Sleeves, Recyclable, 30 Count Natural Cardboard Sleeve printed with Black Font. Made in the USA! - Baby Brewing : Home & Kitchen

Premium Vector Craft cup paper. blank brown coffee cup template with cardboard holder and plastic lid. takeaway craft pack set for hot drink isolated on transparent background. disposable takeout cafe package

Biodegradable Solid White Cardboard 2-Cell /4-Cell Paper Box Cup Holder - China Coffee Cup Holder, Paper Coffee Cup Holder

Coffee Fabric

Sustainable materials used to make takeaway coffee cups

We Can Source It - 100 x Paper Coffee Cup Sleeve Brown Small (8oz) Board Sleeves/Hot Cup Jackets/Coffee Clutches : : Home & Kitchen

Vinglacé Glass-Lined Double Wall Insulated Coffee Mug with Lid - 12 oz – UnMask

Coffee Cup Sleeve 18 Quotes to Choose From and 3 Colors Available. Great Mother's Day, Birthday or Christmas Gift.

Brown Plastic Paper Coffee Cup White Background.One Take Away Cardboard Mug Closed Color Cap Isolated.Retail Mockup Presentation.Ready Business Message. 3d rendering. Stock Illustration