Gen 2 and Gen 3 different is that

1) Gen 2 sizing is S/M, M/L, L/XL - size S/M = the middle size of Gen 3 S and GEN M

GEN 3 sizing is S,M,L,XL,XXL,XXXXL

2) no different in material

3) Gen 3 have more colours

4) same price

if you cannot find the size or colour available , you can refer to this listing as well

click for more information (SG listing)