Go to Amazon.com : https://www.amazon.com/gp/product/B004M04SUM?tag=unlearnreth-20

STM Glove Extra Small 11 Laptop Sleeve Mushroom

Product Description :
3mm neoprene surrounds your laptop
Durable YKK zippers for long lasting protection
Internal zipper guards protects the laptop against abrasion
Designed to fit the 11-inch MacBook Air and works with other 11-inch Netbooks too