What are some good flat pedal shoes for XC racing?
Five Ten Freerider VXi Elements - 398 gram
Five Ten Freerider - 399 gram
Giro Jacket - 416 gram
Shimano AM41 - 420 gram
Teva Links - 440 gram
661 Filter - 680 Gram


So basically, all the available (excluding high-top shoes) flat pedal shoes weigh the same. You could theoretically shave 1 gram by switching to the Freerider VXi Elements, but that would hardly be worth the money.

An alternative could be some light weight skate shoes, but then you would probably loose out on grip and the weight savings would probably still be negligible.

And for comparison Diadora X-Trail 2 Carbon SPD shoes are 335 gram.