Final answer:
Arctic sea hunters made waterproof parkas from intestines of large sea mammals or bears, using sinew to sew the gut strips together.
Step-by-step explanation:
Arctic sea hunters crafted waterproof parkas by sewing together horizontal strips of material sourced from the intestines of large sea mammals or bears. This material is commonly referred to as 'gut garment' and was highly effective in providing protection against harsh weather conditions. The gut used to make these parkas went through a meticulous cleaning, stretching, and drying process. Gut dried during winter turned white, known as 'winter gut', whereas gut dried in the summer acquired a yellowish hue, termed 'summer gut'. These strips were sewn together using sinew, and parkas were sometimes decorated with feathers, fur, or other materials available to the Inuit people of Alaska.