i can't comment on the foil boots, but i have a pair of beast 10 04/05, and they are slightly heavier than my atomic boots, not by much. the beast 10 for me were real comfortable. i buckle tight the top two buckles when skiing around the mountain, and have them real loose when in the park. i find that it gives a softer flex. anyway try them on. i am a size 8 regular shoes, but boot size 26, was way too tight. 26.5 fit perfect. on the other hand the atomics boots I have are 26 and fit perfect. good luck.