That was an interesting exercise. Went into a box of old sporting goods and another box and found 8 old pairs of footwear now in the trash bin. So the official number is
14 pairs. I wear a regular width EU size
42, that is US women's size
9.5, and
US men's size 8. Have worn the bolded pairs within the last year.
#1 are a pair of swim fins I wore long ago for body surfing. Rarely used for decades.
#2 flip flops I wear to venture outside briefly or as camp shoes I keep near my front door at frame top.
#3 a pair of business casual shoes I haven't worm since retiring.
#4 is a worn back-up for #5.
#5 are my cheap street shoes I wear most and wear out soles quickly due to street dancing.
#6 are neoprene surfing boots I sometimes bring backpacking to ford icy cold streams
#7 are down booties I often wear during winter.
#8 old but still clean tennis shoes I used to wear playing table tennis.
#9 is an old set of cheap hiking boots that still have decent soles.
#10 are water wading boots for wading into ocean surf while fishing.
#11 are modern cold weather rubber felt insert winter boots.
#12 my old Kaufman, Sorel Caribou felt insert winter boots that still have excellent soles.
#13 my recently received Zamberlan $380 list hiking boots. Actually, a women's model (functionally unisex) I bought on sale for $281.
#14 my very worn sole and beat up but still usable older Zamberlan hiking boots.