I built these baffles to fix the issue every baffle has with down shift. Most baffles can be kept from shifting by adding lots of extra down but I wanted a design that didn't need extra down that's only purpose was to keep the baffle full. I wanted narrow vertical baffles but wanted to fill less total chambers. That desire lead me to build them in the u shape so it cuts the number of chambers in half. The result was faster/cheaper to stuff than straight vertical baffles with the added reduction in shift because the straight lines were shortened. The corners stop down movement and it will only go around the corner if you move it there. Vertical baffles shift less because the down can only move head to foot which is under much less gravitational force to shift than horizontal baffles when you sleep on your side.