It sometimes feels like transitional weather and our Cream and Blue Sherpa Lined Flannel Shacket will help you get through it. Constructed of quilted flannel, this heavyweight style is perfect for days when you need to keep warm while looking chill. What is a SHACKET?? A Shacket is a blend of a shirt and jacket, except it's a bit oversized and looks like a shirt but made from a heavier material and while the heavier material helps distinguish the shacket piece of outerwear from a shirt, it's not fully a jacket.