"[1] The album was recorded as a three-piece with ex-White Zombie drummer John Tempesta and Chris Traynor (guitarist on the Aftertaste tour) on bass.

[2] Unlike with previous Helmet albums, Size Matters was made with the assistance of digital editing software Pro Tools.

[3] Regarding the cover, Page Hamilton said in a 2005 interview, "the initial attraction was that it was a beautiful photo, this sort of innocence and open mindedness that kids have about things.

The track "Throwing Punches" was also included on the film soundtrack for Underworld, and "Crashing Foreign Cars" was featured in the video game Need for Speed: Underground 2.

He criticized the band's change in sound writing, "Helmet attempt to diversify their portfolio, offering dynamics and approachable melodies and other types of listener-friendly capitulations one wouldn't associate with the folks that dropped Meantime and 'Unsung'.

"[2] Johnny Loftus of AllMusic gave the album 3 stars and wrote in his review, "Size Matters emphasizes for the bloated alt-metal elite what it means to have craft and a little self-control.

At times, elated melodies contradict the darker pounding force of previously established riffs and sound like unnatural ideas that never fully blossomed.

Armed with Frank Bello (Anthrax), John Tempesta (White Zombie), and Chris Traynor (Orange 9mm), the '04 Helmet lineup reads like the New York Metal All-Star team.

"[19] In a review with Rolling Stone, Christian Hoarde gave the release 2 stars out of 5, explaining, "On their first disc in seven years, the manicured riffs remain, but the sludge is so overbearing that anyone born during the Eighties will wonder what once made them special.

Musically, these songs feature the more aggressive riffs and fast-paced drumming that rekindle thoughts of Helmet material found on Strap it On.

They concluded their review by stating, "while it's nice to have a solid rock band like Helmet around again, the cohesion from albums like Meantime and Betty is lacking on this latest effort.

"[20] In 2011, Decibel Magazine gave the album a critical reappraisal, and claimed "Size Matters was not only a more cohesive and confident return from the break-up than some of their contemporaries (looking at you, Prong, [and] lame-o supergroups), but also offered some killer live shows with Frank Bello on bass.

"[22] Norma Jean vocalist Cory Brandon picked "See You Dead" and "Throwing Punches" as among the ten best Helmet songs in an article written for Louder Sound in 2017.