Two grip socks can use the same underfoot technology and still feel different once the boot is laced. With SOXPro Classic and SOXPro Ultra Light, start with the room inside your actual match boots rather than treating one model as universally better.
What the product specifications say
SOXPro Classic is listed at 46 grams and 2.5 millimeters thick, with Grip:IN elements on the sole and heel. Ultra Light is listed at 32 grams and uses a lighter, closer knit with Grip:IN in those same areas. Those specifications describe construction; they are not a promise of extra speed, power or injury prevention.
A case for Classic
Consider Classic when you like a more substantial sock, when the boot leaves some usable volume, or when you want a more structured feel around the foot. Test it in the exact boot and insole you will play in. A different last shape or a thicker replacement insole can change the result quickly.
A case for Ultra Light
Ultra Light makes more sense when you want less fabric between foot and boot, especially in a close-fitting upper. It can reduce the bulk introduced by the sock, but it cannot correct a boot that is the wrong size or shape. A thin sock in an oversized heel cup is still an oversized fit.
Run a match-setup check
Lace the boots as you would for training, then check that the heel stays centered, the toes can spread naturally and no ridge of fabric forms after turns and stops. Pressure over the instep, numbness or a need to loosen the laces dramatically suggests the setup is too crowded. Continued sliding with secure lacing points back to boot fit and volume.
Classic is offered in the listed ranges S 35–40, M 41–46 and L 47–52. Ultra Light lists XS 35–37, S 38–40, M 41–43, L 44–46 and XL 47–49; XL was unavailable at the 29 September check. Stock can change, so confirm the live product page before ordering.