Needed some warm and fitted merino wool socks for cold rides - these fit the bill perfectly - I’m a size 9.5-10 in UK made formal shoes and New Balance trainers (another British brand) - so went for Size Small on these Endura socks which are a tad big initially brand new - but like all wool and cotton socks they shrink slightly after a couple of washes so fit my feet perfectly now - as another size guide, I’m a size 8 in all Italian footwear and trainers which are notoriously big size wise (Tods/Zanotti/Stone Island/Officine Creative for all your cycling fashionistas out there) - so I’d say these Endura socks in the Small size equate to a European/Italian size 42/8 in shoe size - and material wise these are top notch - comfortable/very warm/breathable/nice amount of stretch - and look cool in the Kingfisher Blue colour too - most of my cycling gear is Castelli - but I’ve bought several Endura items in last 12 months and it’s TOP END gear - well made/pro fit/durable/performance driven/cutting edge designs - their long sleeve Pro FS260 jerseys and Pro FS260 bib shorts in the longer bib shorts length are as good as anything I’ve ever bought from Castelli to be honest - so don’t hesitate to buy Endura products - they really are superb

100% recommend these socks - v warm and comfortable for winter