The Size-Up Promise

Kids grow. Your price doesn't punish you for it.

Every Sanity Socks order comes with our Size-Up Promise: when your child outgrows their color tier within 12 months of purchase, you get 20% off the next size up. No receipts to dig up. No hoops.

How it works

  1. Around month 9, we email you automatically — your Size-Up code is unique to your order, ready when you need it.
  2. Outgrew them sooner, or can't find the email? Enter your order email below and we'll re-send your code.
  3. Your code is single-use and tied to your original purchase, valid for 90 days once issued.

One discount. Always the biggest one you qualify for.

We don't stack coupons and we don't run sitewide sales. You get the single best price you're eligible for, and we apply it for you.

Your Size-Up code is 20% off — the deepest discount we offer anywhere, including to families buying for four or more kids. So when you use it, it replaces the multi-kid discount in your cart rather than adding to it, because it's already the larger of the two. You are never worse off for using it, and you never have to do the math.

Check your Size-Up eligibility

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The Size-Up Promise applies to one size-tier upgrade per original order, within 12 months of purchase date. Size-Up codes apply to your full order and do not combine with our multi-kid discounts — we apply the larger of the two automatically. Full terms in our Terms of Service.