matci gismu

x1 is a mat/pad/mattress/pallet [flat, soft, dense form] of material x2.

Also mattress = (kicymatci). See also kicne, tapla, karda, ckana.


In notes:

ckana
x1 is a bed/pallet of material x2 for holding/supporting x3 (person/object/event).
karda
x1 is a card [small nearly-2-dimensional shape/form] of material x2, shape x3.
kicne
x1 cushions x2 with material x3; x1 is a cushion/pillow/pad [for x2] of padding material x3.
tapla
x1 is a tile/cake [shape/form] of material x2, shape x3, thickness x4.
ckabu'u
b1 is bedcloth of material b2.
kicymatci
m1=k2 is a mattress with cushion k1.