Kiwami Writing Mat Underlay A4+: A Soft Underlay That Changes How You Write

Introduction

Some stationery is quietly transformative. The Kiwami Writing Mat Underlay A4+ from Kyoei Plastic is one of those products: it looks like a simple desk underlay, but the writing experience it delivers surprised us in the best way. If your handwriting drifts off-line on envelopes, or you simply want a smoother surface under your paper, this mat deserves a closer look.

About Kyoei Plastic

Kyoei Plastic is an Osaka-based manufacturer founded in 1941, with a long history in plastic stationery including school rulers and similar items. Since 2022 it has been part of the Sakura Cray-Pas group, and its products have repeatedly won excellence awards at Bunpai Messe, a stationery trade show held annually in Osaka in August.

The Kiwami Writing Mat is part of the company’s Kiwami series, a lineup focused on comfort in use. The series also includes other sizes, larger desk mats, and binders, often presented with dedicated corner displays in shops.

What the Kiwami Writing Mat Is

The A4+ size is slightly larger than standard A4, so a full sheet of A4 paper fits completely on the mat. The dimensions are 306mm by 128mm is not the full picture: the mat is listed at 306mm in one dimension, 2mm thick, and soft enough to bend noticeably in the hand.

The packaging uses a black and gold design with a genuinely premium feel, and the mat carries the Kiwami series branding.

The Hand-Printed Grid

The standout feature is the printed grid on the surface. Printing on soft vinyl underlays has historically been difficult, and this mat achieves it through craftspeople hand-printing each sheet one by one for accurate registration. That manual effort is part of what makes the product special.

In practice, you place your paper over the mat and let the grid show through, giving you a guide so your writing stays straight and balanced. This is especially useful for addressing envelopes, where slanted text is a common frustration.

Writing Feel and Performance

The writing feel is the real headline. The soft, flexible surface delivers a remarkably smooth glide, and with a ballpoint pen the impression is of almost no pressure needed at all. The maker notes that the mat pairs well with any pen type.

Testing with a mechanical pencil showed that light pressure still produces a smooth line, while pressing harder adds line contrast and expressiveness. A finer gel-style pen also glided without any sense of pen-tip stiffness. For writers with a light grip or weak pen pressure, this surface is particularly forgiving.

Other Things You Can Do With It

The reverse side is a plain solid surface. When copying or scanning documents, placing the mat underneath reduces show-through from the reverse side of the paper. It also works as a stamping mat and, conveniently, as a mouse pad.

Things to Consider Before Buying

The ultra-smooth writing feel will divide opinion. Just as some people dislike very smooth ballpoint inks, some may find this surface too slick for their taste. The experience is strong enough that it is worth trying before committing.

Another limitation: thick envelopes, show-through-resistant envelopes, and formal envelopes used for monetary gifts could not be used with the mat in testing, since the grid cannot show through them. That is a shame, because formal envelope writing is exactly where a straight-line guide helps most.

Buying Advice

If you regularly write addresses on standard paper or envelopes, struggle with crooked handwriting, or want a noticeably smoother writing surface on a hard desk, this mat is an easy recommendation. The A4+ size covers a full sheet, and the solid reverse adds copying, stamping, and mouse pad utility. If you prefer a firmer, more resistant writing surface, or your main use case involves thick formal envelopes, think it through first.

Conclusion

Plenty of mats have a printed grid, but few combine that convenience with this level of writing comfort and everyday versatility. The Kiwami Writing Mat Underlay A4+ is a small, affordable upgrade that makes everyday writing noticeably better.