Given two (real) normed (linear) spaces
$X$ and
$Y$, let
$X\otimes _{1}Y=(X\otimes Y,\Vert \cdot \Vert )$, where
$\Vert (x,y)\Vert =\Vert x\Vert +\Vert y\Vert$. It is known that
$X\otimes _{1}Y$ is
$2$-UR if and only if both
$X$ and
$Y$ are UR (where we use UR as an abbreviation for uniformly rotund). We prove that if
$X$ is
$m$-dimensional and
$Y$ is
$k$-UR, then
$X\otimes _{1}Y$ is
$(m+k)$-UR. In the other direction, we observe that if
$X\otimes _{1}Y$ is
$k$-UR, then both
$X$ and
$Y$ are
$(k-1)$-UR. Given a monotone norm
$\Vert \cdot \Vert _{E}$ on
$\mathbb{R}^{2}$, we let
$X\otimes _{E}Y=(X\otimes Y,\Vert \cdot \Vert )$ where
$\Vert (x,y)\Vert =\Vert (\Vert x\Vert _{X},\Vert y\Vert _{Y})\Vert _{E}$. It is known that if
$X$ is uniformly rotund in every direction,
$Y$ has the weak fixed point property for nonexpansive maps (WFPP) and
$\Vert \cdot \Vert _{E}$ is strictly monotone, then
$X\otimes _{E}Y$ has WFPP. Using the notion of
$k$-uniform rotundity relative to every
$k$-dimensional subspace we show that this result holds with a weaker condition on
$X$.