socks in M&S,not really 100% cotton,about 75% cotton.
There are one brand named "earlustra" from England. More cotton and more透氣,very good quality. We brought in Wing On for more than 10 yrs. However, they don't 入貨 any more. Maybe it is expensive, for $36 each pair.
Anyone knows where I can buy it,pls let me know because my kid is also大汗.