〜わりに
for, considering (more or less than expected)
Plain form / Noun + の + わりに (な-adj + な)
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わりに says something doesn't match what you'd expect from a standard: この店は値段のわりにおいしい, "this place is good for the price". 割 means "proportion", so it's "out of proportion to".
It follows a noun with の, a plain verb or adjective, or a な-adjective with な: 大変なわりに給料が安い, "the pay is low for such hard work".
It's very close to にしては. わりに is a little more colloquial, and is common with nouns of degree like 年 (age), 値段 (price), 大きさ (size).
On its own, わりと or わりに means "relatively, fairly": わりと簡単だった, "it was fairly easy". Don't confuse it with 代わりに, "instead".
Examples
この店は値段のわりにおいしい。
This place is good for the price.
彼は年のわりに若く見える。
He looks young for his age.
たくさん勉強したわりに、成績が上がらなかった。
For all the studying I did, my grades didn't improve.
この仕事は大変なわりに、給料が安い。
The pay is low for how hard this job is.
今日は寒いわりに、人が多い。
There are a lot of people out, considering how cold it is.